rm registerUserQueue from UnitTests

* This queue was removed in this last commit of this PR and needs to be
removed so the test can run without errors.

Author: jkasten2

iOS_SDK/OneSignalSDK/UnitTests/UnitTestCommonMethods.h

@@ -83,7 +83,6 @@ withNotificationWillShowInForegroundHandler:(OSNotificationWillShowInForegroundB
 
 // Expose OneSignal test methods
 @interface OneSignal (UN_extra)
-+ (dispatch_queue_t) getRegisterQueue;
 + (void)setDelayIntervals:(NSTimeInterval)apnsMaxWait withRegistrationDelay:(NSTimeInterval)registrationDelay;
 @end
 

iOS_SDK/OneSignalSDK/UnitTests/UnitTestCommonMethods.m

@@ -182,18 +182,14 @@ + (void)runBackgroundThreads {
 
 + (void)runThreadsOnEachQueue {
     // the httpQueue makes sure all HTTP request mocks are sync'ed
-    dispatch_queue_t registerUserQueue, notifSettingsQueue;
+    dispatch_queue_t notifSettingsQueue;
 
     [OneSignalHelperOverrider runBackgroundThreads];
 
     notifSettingsQueue = [OneSignalNotificationSettingsIOS10 getQueue];
     if (notifSettingsQueue)
         dispatch_sync(notifSettingsQueue, ^{});
 
-    registerUserQueue = [OneSignal getRegisterQueue];
-    if (registerUserQueue)
-        dispatch_sync(registerUserQueue, ^{});
-    
     [OneSignalClientOverrider runBackgroundThreads];
 
     [UNUserNotificationCenterOverrider runBackgroundThreads];