Style: Replace header guards with #pragma once

editor/editor_main_screen.h

@@ -28,8 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
-#ifndef EDITOR_MAIN_SCREEN_H
-#define EDITOR_MAIN_SCREEN_H
+#pragma once
 
 #include "scene/gui/panel_container.h"
 
@@ -90,5 +89,3 @@ public:
 
 	EditorMainScreen();
 };
-
-#endif // EDITOR_MAIN_SCREEN_H