Set suppressMessageDisplay on displayExecutor (#3922)

Author: MatthiasB94

Firebase/InAppMessaging/Runtime/FIRIAMRuntimeManager.m

@@ -347,10 +347,12 @@ - (void)internalStartRuntimeWithSDKSettings:(FIRIAMSDKSettings *)settings {
                                              activityLogger:self.activityLogger
                                        analyticsEventLogger:analyticsEventLogger];
 
-  // Setting the display component. It's needed in case headless SDK is initialized after
-  // the display component is already set on FIRInAppMessaging.
+  // Setting the message display component and suppression. It's needed in case
+  // headless SDK is initialized after the these properties are already set on FIRInAppMessaging.
   self.displayExecutor.messageDisplayComponent =
       FIRInAppMessaging.inAppMessaging.messageDisplayComponent;
+  self.displayExecutor.suppressMessageDisplay =
+      FIRInAppMessaging.inAppMessaging.messageDisplaySuppressed;
 
   // Both display flows are created on startup. But they would only be turned on (started) based on
   // the sdk mode for the current instance