Cleanup Default Keymaps (#5442)

* Cleanup Default Keymaps to conform to QMK Firmware standards

* Minor fixes

* Revert some changes

keyboards/helix/rev1/keymaps/default/config.h

@@ -18,8 +18,9 @@ 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_USER_H
-#define CONFIG_USER_H
+#pragma once
+
+// place overrides here
 
 /* Use I2C or Serial, not both */
 
@@ -31,5 +32,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MASTER_LEFT
 // #define _MASTER_RIGHT
 // #define EE_HANDS
-
-#endif