Move torbutton default prefs to 000-tor-browser.js

Now they are loaded manually from several places in torbutton components and modules (via torbutton/modules/default-prefs.js). We should move these to tor-browser 000-tor-browser.js prefs file.

Trac:
Parent Ticket: #28745 (moved)

added TorBrowserTeam201911 actualpoints::1 component::applications/tor browser owner::tbb-team parent::28745 priority::medium resolution::fixed severity::normal status::closed tbb-torbutton type::defect labels

I applied the respective fixes to torbutton (commit 59cabca7ade54fa4f5fec2a398456dbc3891009a on master) and tor-browser (commit 548177579c14a34a72f374ec783005f04cfde100 and c2fafa4a2f8fa3ec005bafaab748861ecee49946 on tor-browser-68.2.0esr-9.5-1). We are good here, thanks.

acat, please add some points here.

Trac:
Status: new to closed
Resolution: N/A to fixed
Keywords: N/A deleted, TorBrowserTeam201911 added

Trac:
Actualpoints: N/A to 1

closed

added 8h of time spent

moved to tpo/applications/tor-browser#30851 (closed)