Update Underglow keycodes (#23765)

Co-authored-by: Nick Brassel <nick@tzarc.org>

keyboards/rocketboard_16/keymaps/default/keymap.c

@@ -34,17 +34,17 @@ enum custom_keycodes {
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     [_BASE] = LAYOUT(
-        RGB_MOD,                   KC_NUM,
+        UG_NEXT,                   KC_NUM,
         KC_P7,   KC_P8,   KC_P9,   KC_DEL,
         KC_P4,   KC_P5,   KC_P6,   KC_END,
         KC_P1,   KC_P2,   KC_P3,   KC_F13,
         KC_P0,   MO(1),   KC_PDOT, KC_PENT
     ),
     [_SPEC] = LAYOUT(
-        RGB_RMOD,                   KC_MUTE,
+        UG_PREV,                    KC_MUTE,
         KC_NO,    KC_NO,   KC_NO,   KC_EXAM,
         KC_NO,    KC_NO,   KC_NO,   KC_NO,
-        QK_BOOT,  RGB_TOG, RGB_SPI, RGB_SPD,
+        QK_BOOT,  UG_TOGG, UG_SPDU, UG_SPDD,
         KC_NO,    _______, KC_NO,   KC_NO
     )
 };