Tor Browser 6.5a4 is ignoring additional SocksPorts

Let's assume you have something like that in your torrc-defaults file in Tor Browser:

SocksPort 9150 IPv6Traffic PreferIPv6 KeepAliveIsolateSOCKSAuth
SocksPort 9160 IPv6Traffic PreferIPv6 KeepAliveIsolateSOCKSAuth
ControlPort 9151
CookieAuthentication 1

And let's say you point your Torbirdy to 9160. That setup works perfectly fine with Tor Browser 6.5a3 and breaks with 6.5a4. Setting extensions.torlauncher.socks_port_use_ipc to false (trying to simulate the old behavior) does not fix it. Nor does setting TOR_SOCKS_PORT=9150 help. In fact, looking at the code it seems this is not supported anymore which we should fix.

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