chore: Remove unused type

Author: Jasenkoo

src/VueDatePicker/interfaces.ts

@@ -392,8 +392,6 @@ export interface UIOpts {
     input: CustomClass;
 }
 
-export type UIKey = keyof UIOpts;
-
 export type UIParsed = {
     [K in keyof UIOpts]: Record<string, boolean>;
 };

src/VueDatePicker/utils/defaults.ts

@@ -28,7 +28,6 @@ import type {
     MultiDatesDefault,
     MapPropDatesOpts,
     UIOpts,
-    UIKey,
     UIParsed,
 } from '@/interfaces';
 import { getDate } from '@/utils/date-utils';