Fix Kakoune `fzf` mappings
Fix Kakoune `fzf` mappings

Mnemonics didn't fit how I think about where it opens:

old | new | why
:-- | :-- | :--
C-w | C-t | "window" => in tab
C-s | C-v | "split" => in vertical split (split the horizontal space)
C-v | C-w | "vertical" => in window split

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