Remove empty override functions (#14312)

* Remove empty override functions, 0-9

* Remove empty override functions, A-D

* Remove empty override functions, E-H

* Remove empty override functions, handwired

* Remove empty override functions, I-L

* Remove empty override functions, M-P

* Remove empty override functions, Q-T

* Remove empty override functions, U-Z

keyboards/handwired/dactyl/keymaps/default/keymap.c

@@ -148,12 +148,3 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
   }
   return true;
 }
-
-// Runs just one time when the keyboard initializes.
-void matrix_init_user(void) {
-
-};
-
-
-// Runs constantly in the background, in a loop.
-void matrix_scan_user(void) {};