Thing: Fix dirty warning shown on deletion if unsaved changes (#2892)

Signed-off-by: Florian Hotze <dev@florianhotze.com>

bundles/org.openhab.ui/web/src/pages/settings/things/thing-details.vue

@@ -637,7 +637,7 @@ export default {
         'Delete Thing',
         () => {
           this.$oh.api.delete(url).then(() => {
-            this.dirty = false
+            this.dirty = this.configDirty = this.thingDirty = false
             this.$f7router.back('/settings/things/', { force: true })
           })
         }