Ensure we can submit the dns setup form with the keyboard

dashboard/src/views/SetupView.vue

@@ -162,6 +162,8 @@ onMounted(async () => {
 
         <form ref="form" @submit.prevent="onSubmit()" @input="checkValidity()">
           <fieldset :disabled="busy">
+            <input type="submit" style="display: none" :disabled="busy || !isFormValid"/>
+
             <FormGroup>
               <label for="domainInput">Domain  <sup><a href="https://docs.cloudron.io/installation/#domain-setup" class="help" target="_blank"><i class="fa fa-question-circle"></i></a></sup></label>
               <TextInput id="domainInput" v-model="domain" placeholder="example.com" required />