xfs: remove log recovery quotaoff item dispatch for pass2 commit functions

Quotaoff doesn't actually do anything, so take advantage of the
commit_pass2 pointer being optional and get rid of the switch
statement clause.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>