refactor: active room ID now only in defined in the path

lib/utils/background_push.dart

@@ -586,8 +586,10 @@ class BackgroundPush {
     await room.postLoad();
     final event = await client.database.getEventById(client.id, eventId, room);
 
-    if (((client.activeRoomId?.isNotEmpty ?? false) &&
-            client.activeRoomId == room.id &&
+    final activeRoomId = router.currentState.pathParameters['roomid'];
+
+    if (((activeRoomId?.isNotEmpty ?? false) &&
+            activeRoomId == room.id &&
             client.syncPresence == null) ||
         (event != null && room.notificationCount == 0)) {
       return;

lib/utils/matrix_sdk_extensions.dart/fluffy_client.dart

@@ -7,9 +7,6 @@ import '../famedlysdk_store.dart';
 class FluffyClient extends Client {
   static FluffyClient _instance;
 
-  /// The ID of the currently active room, if there is one. May be null or emtpy
-  String activeRoomId;
-
   factory FluffyClient({testMode = false}) {
     _instance ??= FluffyClient._internal(testMode: testMode);
     return _instance;