user prefs not applied to 'persist:tor' session

[diracdeltas]

the persist:tor session seems to inherit user prefs from persist:default; setting different prefs for this session does not work. for instance, ses.userPrefs.setDictionaryPref('content_settings', ...) for the persist:tor session in browser-laptop seems to do nothing.

if i change appConfig.tor.partition to default in this line, then it works as expected in private tabs (non-tor): brave/browser-laptop@7fdf484#diff-50b5521162e1f47690c976323e95e604R64

tested on 6.1.5

[riastradh-brave]

@jumde reports this is fixed.