[gajim-otr] doesn't send magic whitespace pattern, so no opportunistic OTR

What the hell is up with this line? Due to comparing to stripped encrypted_msg it will never send magic whitespace pattern.

https://dev.gajim.org/gajim/gajim-plugins/blob/master/gotr/otrmodule.py#L625

@asterix didn't know about opportunistic OTR, or what?

What is the point of this option then?

Sorry if I sound a bit aggressive, but I just spent 1.5 hours tracking this down, and after reading the comment on that line I wasn't happy in the slightest.