The user should still be able to open the Preferences dialog, despite the camera functionality being broken.
see https://github.com/spesmilo/electrum/issues/9949
```
6.36 | E | gui.qt.exception_window.Exception_Hook | exception caught by crash reporter
Traceback (most recent call last):
File "electrum\gui\qt\main_window.py", line 2672, in settings_dialog
File "electrum\gui\qt\settings_dialog.py", line 229, in __init__
File "electrum\gui\qt\qrreader\__init__.py", line 96, in find_system_cameras
File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
File "PyInstaller\loader\pyimod02_importers.py", line 450, in exec_module
File "electrum\gui\qt\qrreader\qtmultimedia\__init__.py", line 28, in <module>
File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
File "PyInstaller\loader\pyimod02_importers.py", line 450, in exec_module
File "electrum\gui\qt\qrreader\qtmultimedia\camera_dialog.py", line 32, in <module>
RuntimeError: PyQt6.QtMultimedia cannot import type '���d�⌂' from PyQt6.QtCore
```
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