fix eslint

layouts/admin.vue

 <template>
   <v-app>
-    <NavBar />
+    <Navbar />
     <nuxt />
   </v-app>
 </template>
 
 <script>
-import NavBar from '@/components/NavBar'
+import Navbar from '@/components/Navbar'
 
 export default {
   components: {
-    NavBar
+    Navbar
   }
 }
 </script>