UI: Hide network features if a non-RTMP service is set

Reimplementation of bc80d0c and f2e6122, because they have to be
reverted by 0b9a8aa.

UI/window-basic-settings.hpp

@@ -346,6 +346,8 @@ private:
 
 	OBSService GetStream1Service();
 
+	bool IsServiceOutputHasNetworkFeatures();
+
 private slots:
 	void on_theme_activated(int idx);
 
@@ -395,6 +397,8 @@ private slots:
 
 	void UpdateStreamDelayEstimate();
 
+	void UpdateAdvNetworkGroup();
+
 	void UpdateAutomaticReplayBufferCheckboxes();
 
 	void AdvOutSplitFileChanged();