Fix Android 12 Target-SDK 31+ issues

[ygpedroso]

• Since Android 12+ it is required to explicitly set the
  android:exported property when the corresponding component
  has an intent filter defined.
• Fixes the following Android 12+ issue:
  java.lang.IllegalArgumentException: com.app-xxx: Targeting S+
  (version 31 and above) requires that one of FLAG_IMMUTABLE or
  FLAG_MUTABLE be specified when creating a PendingIntent.
  Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE
  if some functionality depends on the PendingIntent being mutable,
  e.g. if it needs to be used with inline replies or bubbles.

[kiwi-x]

This pull request fixes all my problems I had with Cordova Android 11, too!

[mreis1]

@ygpedroso Thanks. Working just fine.

[saggio89]

This is similar to PR #1158 which was merged into master.
The difference is this has an "If" condition.

int pendingIntentValueFLAG = PendingIntent.FLAG_UPDATE_CURRENT;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) {
     pendingIntentValueFLAG = pendingIntentValueFLAG | PendingIntent.FLAG_IMMUTABLE;
}
final PendingIntent pendingIntent = PendingIntent.getBroadcast(cordova.getActivity().getApplicationContext(), 0, receiverIntent, pendingIntentValueFLAG);

@ygpedroso is this needed for backwards compatibility for older versions of Android?

[kiwi-x]

yes I think so,
'cause on older Android Version (< Android S) You probably don't have the FLAG_IMMUTABLE flag.