Bug#857029: thunderbird: tries to migrate nonexistent ~/.icedove due to unintended meaning of "\ #" syntax

[Ralf-Peter Rohbeck]

Me too. I had migrated from icedove to thunderbird earlier with a 
previous update.
Just removing the comments didn't fix it for me. I moved my profile out 
of the way, deleted ~/.thunderbird, started from scratch, then moved my 
profile back into ~/.thunderbird and edited profile.ini.