Disable delayed auto-start of recording

In the multi-camera recording flow, the `QTimer.singleShot` call that automatically triggered `_start_multi_camera_recording` after starting preview is commented out. This stops the delayed automatic recording start when preview is not yet running.

Author: C-Achard

dlclivegui/gui/main_window.py

@@ -1964,7 +1964,7 @@ def _start_recording(self) -> None:
             # The recording will start after preview is confirmed running
             self.statusBar().showMessage("Starting preview before recording...", 3000)
             # Use a single-shot timer to start recording after preview starts
-            QTimer.singleShot(500, self._start_multi_camera_recording)
+            # QTimer.singleShot(500, self._start_multi_camera_recording)
             return
 
         # Preview already running, start recording immediately