citra_qt: Add indicator in status bar

Since we do not have an overlay yet, it can be confusing whether movie is being recorded or played. This makes it clear.

Status messages (e.g. system archive missing) will be overriden, but that shouldn't be too important when recording movies.

Doubled the status bar updating frequency to provide a better experience. It now updates every second.

src/citra_qt/main.h

@@ -248,6 +248,7 @@ private:
     QLabel* game_fps_label = nullptr;
     QLabel* emu_frametime_label = nullptr;
     QTimer status_bar_update_timer;
+    bool message_label_used_for_movie = false;
 
     MultiplayerState* multiplayer_state = nullptr;
     std::unique_ptr<Config> config;