RadosGW API: incorrect bucket quota in response to HEAD /{bucket}/?usage

RadosGW API: incorrect bucket quota in response to HEAD /{bucket}/?usage

When we try to get the bucket usage via various methods, through curl or while accessing rgw api endpoint at HEAD /{bucket}/?usage doesn't return the updated information. The endpoint was always returning the user quota and not the actual bucket quota which we see after querying the endpoint.

Fixes: https://tracker.ceph.com/issues/62737
Signed-off-by: shreyanshjain7174 <ssanchet@redhat.com>
(cherry picked from commit 78cd82b6e9f36a91f47d44ad2cfae89add335d4c)

Conflicts:
  - path: src/rgw/rgw_rest_s3.cc
    comment: resolve minor conflict