Remove legacy keycodes, part 2 (#18660)

* `KC_SYSREQ` -> `KC_SYRQ`

And one `KC_ALT_ERASE` -> `KC_ERAS`

* `KC_NONUS_BSLASH` -> `KC_NUBS`

* `KC_NUMLOCK` -> `KC_NUM`

* `KC_CLCK` -> `KC_CAPS`

* `KC_SCROLLLOCK` -> `KC_SCRL`

* `KC_LBRACKET` -> `KC_LBRC`

* `KC_RBRACKET` -> `KC_RBRC`

* `KC_CAPSLOCK` -> `KC_CAPS`

keyboards/40percentclub/gherkin/keymaps/stevexyz/keymap.c

@@ -207,7 +207,7 @@ void matrix_init_user(void) {
   // eeconfig_init(); // reset keyboard to a standard default state; useful when new releases messup with eeprom values
   // set num lock on at start (for numonly layer to work)
   if (!host_keyboard_led_state().num_lock) {
-      tap_code(KC_NUMLOCK);
+      tap_code(KC_NUM_LOCK);
   }
 }