This reverts commit 750b2a6313.
This can cause a deadlock if the endpoints are accessed in the core event
loop via execute action.
fzf --listen 6266 --bind 'space:execute:curl localhost:6266'
Technically, there's no reason to use the API because the information is
already available via `{}` and `{q}`, but I'd like to completely remove
the risk of misuse.