undo CL 69070045 / 8539a916d98a

This breaks ^C in win windows, as expected.
People use ^C, win expects and handles ^C,
so I don't think we can just take it away.

I've noticed that it is broken but assumed my ssh
was screwed up.

If you want to make WindowsKey+C,X,V do the
operations, by analogy with command+C,X,V
on Mac, that's fine with me.

««« original CL description
acme: copy/cut/paste with ctl+c,x,v

LGTM=rsc
R=rsc
CC=plan9port.codebot
https://codereview.appspot.com/69070045

»»»

TBR=rsc
CC=burns.ethan, r
https://codereview.appspot.com/96410045
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