Style: Replace header guards with #pragma once

core/input/shortcut.h

@@ -28,8 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
-#ifndef SHORTCUT_H
-#define SHORTCUT_H
+#pragma once
 
 #include "core/input/input_event.h"
 #include "core/io/resource.h"
@@ -55,5 +54,3 @@ public:
 
 	static bool is_event_array_equal(const Array &p_event_array1, const Array &p_event_array2);
 };
-
-#endif // SHORTCUT_H