qemu_migration_params: Avoid deadlock in qemuMigrationParamsReset

qemu_migration_params: Avoid deadlock in qemuMigrationParamsReset

In my recent comnmit v8.5.0-188-gc47f1abb81 I accidentally moved
qemuMigrationParamsResetTLS after qemuDomainObjEnterMonitorAsync not
noticing qemuMigrationParamsResetTLS will try to enter the monitor
again. The second call will time out and return with a domain object
locked. But we're still in monitor section and the object should be
unlocked which means qemuDomainObjExitMonitor will deadlock trying to
lock it again.

Fixes: c47f1abb81194461377a0c608a7ecd87f9ce9146
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>