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/massdrop/alt/keymaps/jdelkins_ss/keymap.c

@@ -144,7 +144,7 @@ void matrix_init_keymap(void) {
     set_rgb_layer(_QWERTY);
     // force numlock on upon startup
     if (!NUMLOCK_ON) {
-        tap_code(KC_NUMLOCK);
+        tap_code(KC_NUM_LOCK);
     }
 };