fix: remove dts spaces (#533)

Co-authored-by: 三咲智子 (Kevin) <sxzz@sxzz.moe>

Author: azaleta

src/core/declaration.ts

@@ -116,7 +116,7 @@ export function getDeclaration(ctx: Context, filepath: string, originalImports?:
 
   const head = ctx.options.version === 2.7
     ? `export {}
-        
+
 declare module 'vue' {`
     : `import '@vue/runtime-core'
 

test/__snapshots__/dts.test.ts.snap

@@ -97,7 +97,7 @@ exports[`dts > vue 2.7 components only 1`] = `
 // We suggest you to commit this file into source control
 // Read more: https://github.com/vuejs/core/pull/3399
 export {}
-        
+
 declare module 'vue' {
   export interface GlobalComponents {
     RouterLink: typeof import('vue-router')['RouterLink']