chore(gui-v2): remove unused import

packages/nc-gui-v2/composables/useTheme/index.ts

@@ -1,7 +1,7 @@
 import { ConfigProvider } from 'ant-design-vue'
 import type { Theme as AntTheme } from 'ant-design-vue/es/config-provider'
 import { useStorage } from '@vueuse/core'
-import { NOCO, hexToRGB, themeV2Colors, toRefs, useCssVar, useInjectionState } from '#imports'
+import { NOCO, hexToRGB, themeV2Colors, useCssVar, useInjectionState } from '#imports'
 
 interface ThemeConfig extends AntTheme {
   primaryColor: string