tpipeline_usepane: target the original tmux pane vim forked the job in #75
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This fixes a small bug I've experienced from the feature I added in #22.
When using the tpipeline_usepane option, if someone switches tmux panes quickly after starting vim, namely before
tmux select-pane -T ...
can execute, it'll change the pane title of the current pane we're on. To prevent this from happening, we target the original pane by using $TMUX_PANE. This variable should exist in every tmux session, but if for some reason it's not present, tmux falls back to the current pane.