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/thevankeyboards/roadkit/keymaps/mjt/keymap.c

@@ -58,7 +58,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     _______,          MO(_DYN)
   ),
   [_ADJUST] = LAYOUT_numpad_4x4( /* Adjustments */
-    KC_NUMLOCK, MACSLEEP,    BACKLIT,         _______, \
+    KC_NUM,     MACSLEEP,    BACKLIT,         _______, \
     KC_BSPC,     _______,    KC_DEL,          \
     EXCEL_LOCK, NUMPAD_LOCK, NAVIGATION_LOCK, _______, \
     _______,                 _______