Change include guards in tmk_core/ and drivers/ to pragma once (#11240)

tmk_core/common/action_code.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 ACTION_CODE_H
-#define ACTION_CODE_H
+
+#pragma once
 
 /** \brief Action codes
  *
@@ -306,5 +306,3 @@ enum swap_hands_param_tap_op {
 #define ACTION_SWAP_HANDS_OFF_ON() ACTION(ACT_SWAP_HANDS, OP_SH_OFF_ON)
 #define ACTION_SWAP_HANDS_ON() ACTION(ACT_SWAP_HANDS, OP_SH_ON)
 #define ACTION_SWAP_HANDS_OFF() ACTION(ACT_SWAP_HANDS, OP_SH_OFF)
-
-#endif /* ACTION_CODE_H */