Fix unmap 4th argument not being optional
Fix unmap 4th argument not being optional

Fixes #1078

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