fixup! ✨(back) allow theme customnization using a configuration file

Author: lunika

src/backend/core/api/viewsets.py

@@ -1757,6 +1757,10 @@ def _load_theme_customization(self):
  settings.THEME_CUSTOMIZATION_FILE_PATH,
  )
  else:
- cache.set(cache_key, theme_customization, settings.THEME_CUSTOMIZATION_CACHE_TIMEOUT)
+ cache.set(
+ cache_key,
+ theme_customization,
+ settings.THEME_CUSTOMIZATION_CACHE_TIMEOUT,
+ )
 
  return theme_customization