Item picker: Disable picker & hide chevron if not yet ready (#2428)

Signed-off-by: Florian Hotze <florianh_dev@icloud.com>

bundles/org.openhab.ui/web/src/components/config/controls/item-picker.vue

@@ -10,7 +10,7 @@
       <f7-button slot="media" icon-f7="list_bullet_indent" @click.native="pickFromModel" />
     </f7-list-item>
     <!-- for placeholder purposes before items are loaded -->
-    <f7-list-item link v-show="!ready" :title="title" :disabled="disabled">
+    <f7-list-item link v-show="!ready" :title="title" disabled no-chevron>
       <f7-button slot="media" icon-f7="list_bullet_indent" @click.native="pickFromModel" />
     </f7-list-item>
   </ul>