[BUG] Crash on exit (MacOS)

[Amparose]

Throughout Blender 4.5 and now in 5, this plugin causes a crash when quitting Blender:

  29 │ # Python backtrace
  30 │   File "/Users/blah/Library/Application Support/Blender/5.0/extensions/blender_org/simple_renaming_panel/preferences/renaming_keymap.py", line 97 in remove_keymap
  31 │   File "/Users/blah/Library/Application Support/Blender/5.0/extensions/blender_org/simple_renaming_panel/preferences/__init__.py", line 26 in unregister
  32 │   File "/Users/blah/Library/Application Support/Blender/5.0/extensions/blender_org/simple_renaming_panel/__init__.py", line 55 in unregister
  33 │   File "/Applications/blender.app/Contents/Resources/5.0/scripts/modules/addon_utils.py", line 566 in disable
  34 │   File "/Applications/blender.app/Contents/Resources/5.0/scripts/modules/addon_utils.py", line 653 in disable_all
  35 │   File "/Applications/blender.app/Contents/Resources/5.0/scripts/modules/bpy/utils/__init__.py", line 366 in _on_exit
  36 │   File "<string>", line 1 in <module>