keep steam desktop layout off while focused

runtime/include/runtime_config.h

@@ -313,6 +313,9 @@ inline void EnsureConfigFile() {
               "[network]\n"
               "enabled = true\n\n"
               "[controller]\n"
+              "# Outside a Steam launch, Steam's desktop layout binds controller buttons\n"
+              "# to mouse and keyboard. While the game has focus, ask a running Steam\n"
+              "# client to use the game layout of steam_input_app_id instead.\n"
               "steam_input_override = true\n"
               "# steam_input_app_id = 480\n\n"
               "[discord]\n"