Listen to text-changed event to update the group filter

Regressed in the Lit conversion Change 334554.

Google-bug-id: b/229140556
Release-Notes: skip`
Change-Id: I18050d6fd3ba1a1f8d6ffb9051bdac9bdde59145
(cherry picked from commit 66d1aaecb9ec7f96f00820486ce292201d797251)
diff --git a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts
index dd4d9bd..81d53f2 100644
--- a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts
+++ b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.ts
@@ -52,6 +52,7 @@
 import {formStyles} from '../../../styles/gr-form-styles';
 import {menuPageStyles} from '../../../styles/gr-menu-page-styles';
 import {when} from 'lit/directives/when';
+import {ValueChangedEvent} from '../../../types/events';
 
 const MAX_AUTOCOMPLETE_RESULTS = 20;
 
@@ -286,6 +287,8 @@
               <gr-autocomplete
                 id="groupAutocomplete"
                 .text=${this.groupFilter ?? ''}
+                @text-changed=${(e: ValueChangedEvent) =>
+                  (this.groupFilter = e.detail.value)}
                 .query=${this.query}
                 placeholder="Add group"
                 @commit=${this.handleAddRuleItem}