Don't evaluate in app messages when paused

* Evaluating IAMs while paused will lead to inaccuracies once IAMs are unpaused.
* For example, duration-since-last IAMs will be evaluated incorrectly and then queue for display once unpaused.
* When IAMs are unpaused, IAM evaluation is re-triggered anyway and will queue the messages for display at that time.

Author: nan-li

iOS_SDK/OneSignalSDK/OneSignalInAppMessages/Controller/OSMessagingController.m

@@ -683,6 +683,10 @@ - (void)messageViewImpressionRequest:(OSInAppMessageInternal *)message {
  Checks to see if any messages should be shown now
  */
 - (void)evaluateMessages {
+    if (_isInAppMessagingPaused) {
+        [OneSignalLog onesignalLog:ONE_S_LL_VERBOSE message:@"Not evaluating in app messages while paused"];
+        return;
+    }
     [OneSignalLog onesignalLog:ONE_S_LL_VERBOSE message:@"Evaluating in app messages"];
     for (OSInAppMessageInternal *message in self.messages) {
         if ([self.triggerController messageMatchesTriggers:message]) {