UI: Disable replay save button when paused

Another indicator to the user that replays can't be saved
when recordings are paused.

UI/window-basic-main.cpp

@@ -9680,6 +9680,9 @@ void OBSBasic::PauseRecording()
 
 		os_atomic_set_bool(&recording_paused, true);
 
+		if (replay)
+			replay->setEnabled(false);
+
 		if (api)
 			api->on_event(OBS_FRONTEND_EVENT_RECORDING_PAUSED);
 
@@ -9724,6 +9727,9 @@ void OBSBasic::UnpauseRecording()
 
 		os_atomic_set_bool(&recording_paused, false);
 
+		if (replay)
+			replay->setEnabled(true);
+
 		if (api)
 			api->on_event(OBS_FRONTEND_EVENT_RECORDING_UNPAUSED);
 	}