Add another missing include in shell_manager.cc
Add another missing include in shell_manager.cc

occivink/kakoune,Somasis/kakoune,alexherbo2/kakoune,jjthrash/kakoune,jkonecny12/kakoune,ekie/kakoune,danr/kakoune,occivink/kakoune,lenormf/kakoune,alexherbo2/kakoune,mawww/kakoune,lenormf/kakoune,mawww/kakoune,flavius/kakoune,danr/kakoune,Somasis/kakoune,casimir/kakoune,ekie/kakoune,casimir/kakoune,casimir/kakoune,ekie/kakoune,jkonecny12/kakoune,lenormf/kakoune,flavius/kakoune,Somasis/kakoune,ekie/kakoune,alexherbo2/kakoune,jjthrash/kakoune,flavius/kakoune,mawww/kakoune,occivink/kakoune,occivink/kakoune,jkonecny12/kakoune,lenormf/kakoune,alexherbo2/kakoune,danr/kakoune,mawww/kakoune,jkonecny12/kakoune,jjthrash/kakoune,casimir/kakoune,danr/kakoune,flavius/kakoune,jjthrash/kakoune,Somasis/kakoune