Revert "move dnsExists error below location field"

This reverts commit b2fc7df06d.

This doens't always work because we can have multiple location fields

dashboard/src/components/AppInstallDialog.vue

@@ -273,6 +273,7 @@ defineExpose({
         </div>
         <div v-else-if="step === STEP.INSTALL">
           <div class="error-label" v-if="formError.generic">{{ formError.generic }}</div>
+          <div class="error-label" v-if="formError.dnsExists">{{ formError.dnsExists }}</div>
 
           <form @submit.prevent="onSubmit(false)" autocomplete="off">
             <fieldset :disabled="busy">
@@ -286,7 +287,6 @@ defineExpose({
                 </InputGroup>
                 <div class="warning-label" v-show="domainProvider === 'noop' || domainProvider === 'manual'" v-html="$t('appstore.installDialog.manualWarning', { location: ((location ? location + '.' : '') + domain) })"></div>
                 <div class="error-label" v-if="formError.location">{{ formError.location }}</div>
-                <div class="error-label" v-if="formError.dnsExists">{{ formError.dnsExists }}</div>
               </FormGroup>
 
               <FormGroup v-for="(port, key) in secondaryDomains" :key="key">