changed scope of `tmux_repl_id` from `global` to `current`
changed scope of `tmux_repl_id` from `global` to `current`

By setting the tmux_repl_id in the `current` scope it is possible to have
different REPLs for different buffers or windows.

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