chore(fzf-lua): use newer 'fzf_exec' API (#64)

[ibhagwan]

Replace fzf_wrap with fzf_exec API as discussed in #64

[ibhagwan]

Not sure why this fails on stylua, I can try and fix it or you can manually merge using:

git fetch origin pull/67/head:pr_67
git switch pr_67
<fix stylua errors>
git commit --amend
git switch master
git merge pr_67
git push

[stevearc]

Awesome, thanks for the patch!