[diff] ensure diff command does not use logger logging when file mode…

… is picked

bundlebee-core/src/main/java/io/yupiik/bundlebee/core/command/impl/DiffCommand.java

@@ -299,6 +299,7 @@ private void doWrite(final Supplier<String> contentProvider) {
                 } catch (final IOException ioe) {
                     throw new IllegalStateException(ioe);
                 }
+                break;
             default:
                 log.info(contentProvider);
         }