Item Add: Navigate to the new Item once added (#3010)

Currently, if you go to Settings -> Items -> Add -> Save, you'll be
brought back to the Items list (back navigation).

This PR changes this behavior so that after the new item is saved/added,
the user is redirected to the Item Details page **of that new item**, so
they can immediately work on it.

Signed-off-by: Jimmy Tanagra <jcode@tanagra.id.au>

bundles/org.openhab.ui/web/src/pages/settings/items/item-edit.vue

@@ -217,7 +217,11 @@ export default {
         }
 
         this.dirty = false
-        this.$f7router.back()
+        if (this.createMode) {
+          this.$f7router.navigate('/settings/items/' + this.item.name)
+        } else {
+          this.$f7router.back()
+        }
       }).catch((err) => {
         this.$f7.toast.create({
           text: 'Item not saved: ' + err,