Running setApplicationIconBadgeNumber on mainThread

This is a UIApplication method so we need to run it on the main thread. It can be run on background threads through wrapper SDKs.

Author: emawby

iOS_SDK/OneSignalSDK/Source/OneSignal.m

@@ -2221,7 +2221,9 @@ + (BOOL)clearBadgeCount:(BOOL)fromNotifOpened {
     bool wasBadgeSet = [UIApplication sharedApplication].applicationIconBadgeNumber > 0;
 
     if (fromNotifOpened || wasBadgeSet) {
-        [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
+        [OneSignalHelper runOnMainThread:^{
+            [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
+        }];
     }
 
     return wasBadgeSet;