Recognize both <tab> and <c-i> as forward jump
Recognize both <tab> and <c-i> as forward jump

Now that Kakoune opts into extended key reporting, <c-i> is correctly
reported and hence needs to be mapped to forward jump.

We still need to keep <tab> mapped to it for legacy terminals.

Should fix #4333

mawww/kakoune,mawww/kakoune,casimir/kakoune,jkonecny12/kakoune,casimir/kakoune,jkonecny12/kakoune,jkonecny12/kakoune,mawww/kakoune,mawww/kakoune,jkonecny12/kakoune,casimir/kakoune,casimir/kakoune