fix: directly import from vue-router (#572)

Author: DepkaCZ

src/runtime/composables/head.ts

@@ -3,7 +3,7 @@ import { getActiveHead } from 'unhead'
 import type { useHead as useHead$1 } from '@unhead/vue'
 import { onBeforeUnmount } from 'vue'
 import { useRoute } from 'vue-router'
-import { useRouter } from '#vue-router'
+import { useRouter } from 'vue-router'
 
 // This is used to store the active head for each path as long as the path's page is still in the DOM
 const headMap = new Map<