Revert "Ensure receiver unregistered synchronously in onDestroy"

This reverts commit e55aa17399.

mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt

@@ -35,12 +35,6 @@ fun Long.toPluralInt(): Int {
     return (this % 1000000000).toInt() + 1000000000
 }
 
-fun Context.ensureReceiverUnregistered(receiver: BroadcastReceiver) {
-    try {
-        unregisterReceiver(receiver)
-    } catch (_: IllegalArgumentException) { }
-}
-
 @SuppressLint("Recycle")
 fun <T> useParcel(block: (Parcel) -> T) = Parcel.obtain().run {
     try {