When joining a room only allow clients to select a video with the same name as the one already selected by room creator

desktop-client/main.py

@@ -457,7 +457,7 @@ class VlcSyncApp(QMainWindow):
         QMessageBox.information(self, "File Required", f"To join this room, you need to select:\\n\\nName: {req_name}\\nSize: {req_size / (1024*1024):.1f} MB")
         
         file_path, _ = QFileDialog.getOpenFileName(
-            self, f"Select {req_name}", "", "Video Files (*.mp4 *.mkv *.avi *.mov *.webm);;All Files (*)"
+            self, f"Select {req_name}", "", f"Required File ({req_name})"
         )
         
         if file_path: