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/flehrad/bigswitch/bigswitch.h

@@ -14,15 +14,13 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
-#ifndef BIGSWITCH_H
-#define BIGSWITCH_H
+
+#pragma once
 
 #include "quantum.h"
 
 #define LAYOUT( \
-  K00  \
+    k00 \
 ) { \
-  { K00 }  \
+    { k00 } \
 }
-
-#endif

keyboards/flehrad/bigswitch/config.h

@@ -14,8 +14,8 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
-#ifndef CONFIG_H
-#define CONFIG_H
+
+#pragma once
 
 #include "config_common.h"
 
@@ -52,5 +52,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define RGBLIGHT_ANIMATIONS
 #define RGBLED_NUM 8
 #endif
-
-#endif