Downgrade vue-fragment as the upgrade broke oh-repeater in some circu…

…mstances (#2514)

When we upgrade to Vue 3, we can remove this dependency as Vue 3 has
this functionality integrated, see
https://api.vueframework.com/guide/migration/fragments.html.

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

bundles/org.openhab.ui/web/package.json

@@ -91,7 +91,7 @@
     "vue-codemirror": "^4.0.6",
     "vue-draggable-resizable": "^2.3.0",
     "vue-echarts": "^6.6.9",
-    "vue-fragment": "^1.6.0",
+    "vue-fragment": "^1.5.1",
     "vue-fullscreen": "^2.6.1",
     "vue-grid-layout": "^2.4.0",
     "vue-i18n": "^8.28.2",