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/6ball/6ball.h

@@ -1,14 +1,10 @@
-#ifndef SIXBALL_H
-#define SIXBALL_H
+#pragma once
 
 #include "quantum.h"
 
 #define LAYOUT( \
-      k01, k02, k03, \
-      k04, k05, k06 \
-) \
-{ \
-    { k02, k03, k06, k05, k04, k01 } \
-} 
-
-#endif
+    k05, k00, k01, \
+    k04, k03, k02 \
+) { \
+    { k00, k01, k02, k03, k04, k05 } \
+}

keyboards/6ball/config.h

@@ -15,8 +15,7 @@ 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"
 
@@ -46,5 +45,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define DIODE_DIRECTION COL2ROW
 
 #define TAPPING_TERM 200
-
-#endif