`media-src 'self' blob:;` + `ubConfig.uiSettings.cspAllow.mediaSrc` key
- allow adding additional rules using new key
ubConfig.uiSettings.cspAllow.mediaSrc
- added default CSP rule
media-src 'self' blob:;
ubConfig.uiSettings.cspAllow.mediaSrc
media-src 'self' blob:;