Fix mutt_refresh() pausing during macro events.

Fix mutt_refresh() pausing during macro events.

Changeset a07e8215a0ef split input buffering into two pools.
Unfortunately, the mutt_refresh() was not changed to check the correct
buffer count, resulting in unnecessary refreshes during macros.

The SSL interactive certificate prompts set OPTIGNOREMACROEVENTS and
then put up a confirmation menu.  Perhaps we've just been lucky, but
it seems we should refresh the screen in those cases if we're in the
middle of a macro.  Add a check for this option in mutt_refresh() too.