monitor/qmp: Update comment for commit 4eaca8de268

Commit 4eaca8de268 dropped monitor_qmp_respond()'s parameter @id
without updating its function comment.  Fix that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190816193305.12090-1-armbru@redhat.com>
1 file changed