md-bitmap: remove the checking of 'pers->quiesce' from location_store()

After commit 4d27e927344a ("md: don't quiesce in mddev_suspend()"),
there is no need to check 'pers->quiesce' before calling
mddev_suspend().

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230825030956.1527023-5-yukuai1@huaweicloud.com