Cleanup Default Keymaps (#5442)

* Cleanup Default Keymaps to conform to QMK Firmware standards

* Minor fixes

* Revert some changes

keyboards/ckeys/obelus/keymaps/default/config.h

@@ -1,6 +1,3 @@
-#ifndef CONFIG_USER_H
-#define CONFIG_USER_H
+#pragma once
 
-#include "../../config.h"
-// Add overrides here 
-#endif
+// place overrides here

keyboards/ckeys/obelus/keymaps/default/keymap.c

@@ -1,7 +1,4 @@
 #include QMK_KEYBOARD_H
-#ifdef AUDIO_ENABLE
-  #include "audio.h"
-#endif
 
 extern keymap_config_t keymap_config;