Prevent buffering of job output and excessive polling (#4259)

When 'close_cb' is set for job_start(), but out_cb or err_cb isn't, vim
buffers data instead of dropping it (in case someone wanted to read and
process it in close_cb), and additionally polls for new data every 10
milliseconds, causing excessive wakeups and CPU usage. Since we don't
read the data anywhere outside of out_cb/err_cb, any LSP that prints an
error to stderr triggers this and vim keeps spinning until :ALEStopAllLSPs.

Fix this by always setting both callbacks, thus dropping any data we're
not interested in.

See https://github.com/vim/vim/issues/10758 for an upstream report of
the excessive polling. It's possible this is intentional, I dunno.

Fixes: b42153eb1786 ("Fix #4098 - Clear LSP data when servers crash")

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