electron-builder: Restore "warningsAsErrors: false" to the new electr…

…on-builder config file

We get the following, otherwise, it would seem:

  warning 6010: install function "EnvVarUpdate" not referenced - zeroing code (179-395) out

followed by:

  Error: warning treated as error

And then electron-builder exits with that as the error status.
So, I suppose we want to avoid that.

script/electron-builder.config.js

@@ -273,7 +273,8 @@ let options = {
     // Hardcoding it here means it will always be used as generated from
     // the AppID 'dev.pulsar-edit.pulsar'. If this value ever changes,
     // A PR to GitHub Desktop must be made with the updated value.
-    include: "resources/win/installer.nsh"
+    include: "resources/win/installer.nsh",
+    warningsAsErrors: false
   },
 
   extraMetadata: {},