fix(tmux): get the last non-slash element
fix(tmux): get the last non-slash element

After this `v8.4.0` [1] release, the output of the paths have a slash at
the end.

Refs:

1. https://github.com/sharkdp/fd/blob/master/CHANGELOG.md#v840

brunohenrique/dotfiles,brunohenrique/dotfiles