Skip output synchronization query when explicitly disabled

Some terminals misbehave when queried for output synchronization support,
such as Windows Terminal as reported in

  https://github.com/mawww/kakoune/issues/5032

The relatively long response from a terminal which does support output-sync
is also prone to getting torn over a slow link such as a serial console,
causing stray input to the editor.

In ui_options, the terminal_synchronized option controls the use of this
feature, but unfortunately the query is unconditionally sent at startup
even when this is set false.

Skip the query at startup when terminal_synchronized is explicitly false.

We query at most once per terminal in set_ui_options so the behaviour
is correct both when kakoune is started with terminal_synchronized unset
and when it is started with terminal_synchronized set false but this is
later unset.

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