Added missing include guard

Author: sadiuk

include/nbl/ui/KeyCodes.h

@@ -1,4 +1,5 @@
-
+#ifndef _MNL_UI_KEYCODES_H_INCLUDED_
+#define _MNL_UI_KEYCODES_H_INCLUDED_
 namespace nbl::ui
 {
 	enum E_KEY_CODE : uint8_t
@@ -197,4 +198,5 @@ namespace nbl::ui
 		EMB_BUTTON_5,
 		EMB_COUNT,
 	};
-};
+};
+#endif