small fix login form submit button

src/components/User/Auth.vue

@@ -1,5 +1,5 @@
 <template>
-    <v-form>
+    <v-form @submit.prevent>
         <v-text-field :label="l.email" v-model="form.email" type="email" required></v-text-field>
         <v-text-field :label="l.password" v-model="form.password" type="password" required></v-text-field>
         <template v-if="mode==='register'">
@@ -7,8 +7,8 @@
             <v-img :src="`/api/user/captcha?${captchaIter}`" class="my-2" height="100px"></v-img>
             <v-text-field :label="l.confirmCaptcha" v-model="form.captcha" required></v-text-field>
         </template>
-        <v-btn @click="login" :color="mode==='login' ? 'green' : 'grey'">{{l.signin}}</v-btn>
-        <v-btn @click="register" :color="mode==='register' ? 'green' : 'grey'" class="float-right">{{l.signup}}</v-btn>
+        <v-btn @click="login" :color="mode=='login' ? 'green' : 'grey'" :type="mode=='login' ? 'submit' : 'button'">{{l.signin}}</v-btn>
+        <v-btn @click="register" :color="mode=='register' ? 'green' : 'grey'" :type="mode=='register' ? 'submit' : 'button'" class="float-right">{{l.signup}}</v-btn>
     </v-form>
 </template>