fix InsertMode::OpenLineBelow behaviour in prepare_insert
fix InsertMode::OpenLineBelow behaviour in prepare_insert

alpha123/kakoune,flavius/kakoune,elegios/kakoune,occivink/kakoune,Asenar/kakoune,casimir/kakoune,occivink/kakoune,mawww/kakoune,jkonecny12/kakoune,lenormf/kakoune,danr/kakoune,ekie/kakoune,Asenar/kakoune,ekie/kakoune,jjthrash/kakoune,elegios/kakoune,rstacruz/kakoune,danr/kakoune,alexherbo2/kakoune,jjthrash/kakoune,xificurC/kakoune,casimir/kakoune,zakgreant/kakoune,danielma/kakoune,mawww/kakoune,alexherbo2/kakoune,xificurC/kakoune,flavius/kakoune,Somasis/kakoune,mawww/kakoune,jkonecny12/kakoune,danielma/kakoune,Somasis/kakoune,alexherbo2/kakoune,jkonecny12/kakoune,Somasis/kakoune,rstacruz/kakoune,jjthrash/kakoune,danielma/kakoune,lenormf/kakoune,casimir/kakoune,flavius/kakoune,danr/kakoune,xificurC/kakoune,zakgreant/kakoune,Asenar/kakoune,lenormf/kakoune,zakgreant/kakoune,casimir/kakoune,alpha123/kakoune,Somasis/kakoune,occivink/kakoune,Asenar/kakoune,jkonecny12/kakoune,jjthrash/kakoune,elegios/kakoune,mawww/kakoune,danielma/kakoune,xificurC/kakoune,occivink/kakoune,ekie/kakoune,zakgreant/kakoune,lenormf/kakoune,flavius/kakoune,rstacruz/kakoune,elegios/kakoune,rstacruz/kakoune,alexherbo2/kakoune,danr/kakoune,ekie/kakoune,alpha123/kakoune,alpha123/kakoune