Swizzling Fix (#107)

• Fixes an issue where a swizzled implementation of the UNUserNotificationCenter.setDelegate() method was not calling back to the original implementation if it had previously been set.

Author: Nightsd01

OneSignalExample/Assets/OneSignal/Platforms/iOS/OneSignalUnityRuntime.m

@@ -116,9 +116,11 @@ + (void)load {
 
 static Class delegateClass = nil;
 
-- (void) setOneSignalUnityDelegate:(id<UIApplicationDelegate>)delegate {
-    if(delegateClass != nil)
-        return;
+- (void) setOneSignalUnityDelegate:(id<UIApplicationDelegate>)delegate {
+    if(delegateClass) {
+        [self setOneSignalUnityDelegate:delegate];
+        return;
+    }
 
     delegateClass = getClassWithProtocolInHierarchy([delegate class], @protocol(UIApplicationDelegate));