PERF: Eradicate N+1 queries from the theme admin page

app/models/theme_setting.rb

@@ -9,6 +9,7 @@ class ThemeSetting < ActiveRecord::Base
     theme.clear_cached_settings!
     theme.remove_from_cache!
     theme.theme_fields.update_all(value_baked: nil)
+    theme.theme_settings.reload
     SvgSprite.expire_cache if self.name.to_s.include?("_icon")
     CSP::Extension.clear_theme_extensions_cache! if name.to_s == CSP::Extension::THEME_SETTING
   end