ios: subscribe to all events if there is at least one listeners

Author: hoangvvo

ios/RNSpotifyRemoteAppRemote.m

@@ -460,14 +460,20 @@ -(void)resetEventSubscriptions{
 // Will be called when this module's first listener is added.
 -(void)startObserving {
     // Set up any upstream listeners or background tasks as necessary
-    [_eventSubscriptions setValue:@YES forKey:eventType];
+    [_eventSubscriptions setValue:@YES forKey:EventNamePlayerStateChanged];
+    [_eventSubscriptions setValue:@YES forKey:EventNamePlayerContextChanged];
+    [_eventSubscriptions setValue:@YES forKey:EventNameRemoteDisconnected];
+    [_eventSubscriptions setValue:@YES forKey:EventNameRemoteConnected];
     [self handleEventSubscriptions];
 }
 
 // Will be called when this module's last listener is removed, or on dealloc.
 -(void)stopObserving {
     // Remove upstream listeners, stop unnecessary background tasks
-    [_eventSubscriptions setValue:@NO forKey:eventType];
+    [_eventSubscriptions setValue:@NO forKey:EventNamePlayerStateChanged];
+    [_eventSubscriptions setValue:@NO forKey:EventNamePlayerContextChanged];
+    [_eventSubscriptions setValue:@NO forKey:EventNameRemoteDisconnected];
+    [_eventSubscriptions setValue:@NO forKey:EventNameRemoteConnected];
     [self handleEventSubscriptions];
 }