A11Y: fix topic admin menu button colors for WCAG colors (#27007)

* A11Y: fix topic admin menu button colors for WCAG colors

* do not duplicate attr

app/assets/javascripts/discourse/app/components/topic-admin-menu.gjs

@@ -88,10 +88,9 @@ export default class TopicAdminMenu extends Component {
           <DMenu
             @identifier="topic-admin-menu"
             @onRegisterApi={{this.onRegisterApi}}
-            @triggerClass="toggle-admin-menu"
             @modalForMobile={{true}}
             @autofocus={{true}}
-            @class="btn-default btn-icon"
+            @triggerClass="btn-default btn-icon toggle-admin-menu"
           >
             <:trigger>
               {{icon "wrench"}}

app/assets/stylesheets/wcag.scss

@@ -12,12 +12,9 @@
 }
 
 html.discourse-no-touch {
-  .btn-default:not(.btn-flat, .btn-danger, .btn-primary),
-  .btn-icon:not(.btn-flat, .btn-danger, .btn-primary) {
-    &.btn-default {
-      .d-icon {
-        color: var(--primary-medium);
-      }
+  .btn-default {
+    .d-icon {
+      color: var(--primary-medium);
     }
     &:hover,
     &.btn-hover,
@@ -32,7 +29,7 @@ html.discourse-no-touch {
   }
   .btn-icon.ok,
   .btn-icon.cancel,
-  .btn-danger:not(.btn-flat) {
+  .btn-danger:not(.btn-flat, .btn-transparent) {
     .d-icon {
       color: var(--secondary);
     }