fix visibility notice styles

src/components/post_status_form/post_status_form.vue

@@ -13,7 +13,7 @@
           v-if="!$store.state.users.currentUser.locked && newStatus.visibility == 'private' && !disableLockWarning"
           keypath="post_status.account_not_locked_warning"
           tag="p"
-          class="visibility-notice"
+          class="visibility-notice notice-dismissible"
           scope="global"
         >
           <button
@@ -70,7 +70,7 @@
         </p>
         <p
           v-else-if="newStatus.visibility === 'direct'"
-          class="visibility-notice"
+          class="visibility-notice notice-dismissible"
         >
           <span v-if="safeDMEnabled">{{ $t('post_status.direct_warning_to_first_only') }}</span>
           <span v-else>{{ $t('post_status.direct_warning_to_all') }}</span>