Remove redundant bool casting

js/views/conversation_view.js

@@ -1339,7 +1339,7 @@
       // In future, we may be able to unsend private messages also
       // isServerDeletable also defined in ConversationHeader.tsx for
       // future reference
-      const isServerDeletable = !!isPublic;
+      const isServerDeletable = isPublic;
 
       const warningMessage = (() => {
         if (isPublic) {

ts/components/conversation/ConversationHeader.tsx

@@ -363,7 +363,7 @@ export class ConversationHeader extends React.Component<Props> {
       i18n,
     } = this.props;
 
-    const isServerDeletable = !!isPublic;
+    const isServerDeletable = isPublic;
     const deleteMessageButtonText = i18n(
       isServerDeletable ? 'unsend' : 'delete'
     );