fix: Do not ask for reason to delete not sent messages

lib/pages/chat/chat.dart

@@ -753,7 +753,8 @@ class ChatController extends State<ChatPageWithRoom> {
   }
 
   void redactEventsAction() async {
-    final reasonInput = await showTextInputDialog(
+    final reasonInput = selectedEvents.any((event) => event.status.isSent)
+        ? await showTextInputDialog(
             context: context,
             title: L10n.of(context)!.redactMessage,
             message: L10n.of(context)!.redactMessageDescription,
@@ -765,7 +766,8 @@ class ChatController extends State<ChatPageWithRoom> {
             ],
             okLabel: L10n.of(context)!.remove,
             cancelLabel: L10n.of(context)!.cancel,
-    );
+          )
+        : <String>[];
     if (reasonInput == null) return;
     final reason = reasonInput.single.isEmpty ? null : reasonInput.single;
     for (final event in selectedEvents) {