Change keyboard level include guards to pragma once (#14248)

* Change keyboard level include guards to `pragma once`

And clean up a lot of layout macros

* Oops

* Remove dangling endif

keyboards/planck/keymaps/cbbrowne/config.h

@@ -14,8 +14,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef CONFIG_USER_H
-#define CONFIG_USER_H
+#pragma once
 
 #ifndef NO_DEBUG
 #define NO_DEBUG
@@ -28,7 +27,7 @@
 
 #define LEADER_TIMEOUT 300
 
-#ifndef LIGHT_CONFIG_H
+#ifndef KEYBOARD_planck_light
 #define BACKLIGHT_BREATHING
 #endif
 
@@ -42,6 +41,3 @@
  * borrowed from basic keymap            */
 
 #define _____   KC_NO
-
-#endif
-