[Keyboard] Enable RGB Matrix VIA side for Pachi RGB (#13308)

keyboards/xelus/pachi/rgb/keymaps/via/config.h

@@ -19,6 +19,9 @@
 // 3 layers or else it will not fit in EEPROM
 #define DYNAMIC_KEYMAP_LAYER_COUNT 3
 
+// Enable RGB Matrix
+#define VIA_QMK_RGBLIGHT_ENABLE
+
 #define USB_POLLING_INTERVAL_MS 1
 #define QMK_KEYS_PER_SCAN 4