Fix missing footer element for Item Vue component (#2135)

Fixes #2133.
Regression from #2087.

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

bundles/org.openhab.ui/web/src/components/item/item.vue

@@ -11,6 +11,7 @@
     <oh-icon v-if="!noIcon && item.category" slot="media" :icon="item.category" :state="(noState) ? null : (context && context.store) ? context.store[item.name].state : item.state" height="32" width="32" />
     <span v-else-if="!noIcon" slot="media" class="item-initial">{{ item.name[0] }}</span>
     <f7-icon v-if="!item.editable && !ignoreEditable" slot="after-title" f7="lock_fill" size="1rem" color="gray" />
+    <slot name="footer" #footer />
     <div v-if="!noTags" slot="subtitle">
       <f7-chip v-for="tag in getNonSemanticTags(item)" :key="tag" :text="tag" media-bg-color="blue" style="margin-right: 6px">
         <f7-icon slot="media" ios="f7:tag_fill" md="material:label" aurora="f7:tag_fill" />