[Offline Plugin] Miss security flags when registering the broadcast receiver in Android 14

[harrydabeeo]

I implemented the offline plugin and ran it on Android 14. The app met a crash due to missing security flags for the broadcast receiver.
Hope be fixed soon.

Caused by: java.lang.SecurityException:  One of RECEIVER_EXPORTED or RECEIVER_NOT_EXPORTED should be specified when a receiver isn't being registered exclusively for system broadcasts
                                                                                                    	at android.os.Parcel.createExceptionOrNull(Parcel.java:3069)
                                                                                                    	at android.os.Parcel.createException(Parcel.java:3053)
                                                                                                    	at android.os.Parcel.readException(Parcel.java:3036)
                                                                                                    	at android.os.Parcel.readException(Parcel.java:2978)
                                                                                                    	at android.app.IActivityManager$Stub$Proxy.registerReceiverWithFeature(IActivityManager.java:6157)
                                                                                                    	at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1913)
                                                                                                    	at android.app.ContextImpl.registerReceiver(ContextImpl.java:1853)
                                                                                                    	at android.app.ContextImpl.registerReceiver(ContextImpl.java:1841)
                                                                                                    	at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:772)
                                                                                                    	at org.maplibre.android.plugins.offline.offline.OfflineDownloadService.onCreate(OfflineDownloadService.java:65)
                                                                                                    	at android.app.ActivityThread.handleCreateService(ActivityThread.java:5098)
                                                                                                    	at android.app.ActivityThread.-$$Nest$mhandleCreateService(Unknown Source:0) 
                                                                                                    	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2506) 
                                                                                                    	at android.os.Handler.dispatchMessage(Handler.java:106) 
                                                                                                    	at android.os.Looper.loopOnce(Looper.java:230) 
                                                                                                    	at android.os.Looper.loop(Looper.java:319) 
                                                                                                    	at android.app.ActivityThread.main(ActivityThread.java:8919) 
                                                                                                    	at java.lang.reflect.Method.invoke(Native Method) 
                                                                                                    	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:578) 
                                                                                                    	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103) 

[tr4n]

@louwers I created a pull request to fix this issue. It works from my side.
Could you review it?
#78