[Keymap] update helix/rev2:yshrsmz keymap (#9047)

* update helix keymap

* use set_single_persistent_default_layer

keyboards/helix/rev2/keymaps/yshrsmz/config.h

@@ -17,10 +17,10 @@ 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/>.
 */
+
 #pragma once
 
-/* auto shift config */
-#define AUTO_SHIFT_TIMEOUT 150
+// place overrides here
 
 // If you need more program area, try select and reduce rgblight modes to use.