remove redundant site data prefs
remove redundant site data prefs

we've never used these
- service workers are disabled (or soon to be covered by dFPI when enabled) and sanitizing is already done (or will be done via enhanced cookie cleaning)
- storage API, storage access API: we sanitize on close, and sites are isolated by eTLD+1
ghacksuserjs/ghacks-user.js,ghacksuserjs/ghacks-user.js