Fix remove of highlighters with trailing / in their name
Fix remove of highlighters with trailing / in their name

Fixes #1914

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