UI: Fix potential crash when outputs change

If the service settings change and the output type changes, the previous
signals would attempt to disconnect after the output has been destroyed,
and subsequently that would cause a crash.

UI/window-basic-main-outputs.cpp

@@ -662,6 +662,11 @@ bool SimpleOutput::StartStreaming(obs_service_t *service)
 
 	/* XXX: this is messy and disgusting and should be refactored */
 	if (outputType != type) {
+		streamDelayStarting.Disconnect();
+		streamStopping.Disconnect();
+		startStreaming.Disconnect();
+		stopStreaming.Disconnect();
+
 		streamOutput = obs_output_create(type, "simple_stream",
 				nullptr, nullptr);
 		if (!streamOutput)
@@ -1349,6 +1354,11 @@ bool AdvancedOutput::StartStreaming(obs_service_t *service)
 
 	/* XXX: this is messy and disgusting and should be refactored */
 	if (outputType != type) {
+		streamDelayStarting.Disconnect();
+		streamStopping.Disconnect();
+		startStreaming.Disconnect();
+		stopStreaming.Disconnect();
+
 		streamOutput = obs_output_create(type, "adv_stream",
 				nullptr, nullptr);
 		if (!streamOutput)