windowlist string & title not working with -d -m

[Peder Stray]

Not that often i start screen with -d -m, but i did today and noticed that 
some settings wasn't used from my .screenrc, namely "windowlist string" 
and "windowlist title".  Looking through the source i notice that 
windowlist has the NEED_DISPLAY flag in comms (in comm.c).  Guess thats 
not 100% correct as the sting and title subcommands doesn't need a screen 
to work, but the other does.  Not sure how to fix it the right way, but 
removing NEED_DISPLAY from the flags does at least set those strings when 
using -d -m.

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  Peder Stray