Add `rxvt` to the pattern for terms where Escape should not be mapped
Add `rxvt` to the pattern for terms where Escape should not be mapped

Originally submitted in relation to:

  https://github.com/wincent/command-t/pull/151

For some reason, had a merge conflict, so in applying it, I took the
opportunity to alphabetize the alternatives within the regex.

Signed-off-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@hurrell.net>

supriyantomaftuh/command-t,vrkansagara/command-t,yrro/command-t,vrkansagara/command-t,lencioni/command-t,wincent/command-t,lencioni/command-t,supriyantomaftuh/command-t,besarthoxhaj/command-t,wincent/command-t,mtimkovich/command-t,mtimkovich/command-t,besarthoxhaj/command-t,wincent/command-t,yrro/command-t