add environment variable to hide TBB's logo

Speaking as a user of Tails and a maintainer of Whonix, I want to point out, that showing the Tor Browser Bundle Logo when using tor-launcher only for configuring Tor without TBB is inappropriate and confusing. It should not be shown in that mode.

Could you please add an environment variable such as TOR_HIDE_LOGO?

That would also be useful to avoid trademark issues when redistributing original, unmodified TBB in (linux) distributions.

#14121 (moved)
#12451 (moved)