chore(types): remove unnecessary export statements from global and unocss type definitions

src/types/global.ts

@@ -7,5 +7,3 @@ declare module 'vue' {
     $__DEV__: boolean;
   }
 }
-
-export {};

src/types/unocss.ts

@@ -16,5 +16,3 @@ declare module 'vue' {
   interface HTMLAttributes
     extends Partial<Record<import('@unocss/preset-attributify').AttributifyNames, boolean | string>> {}
 }
-
-export {};