LU-10101 tests: correct sanity-quota call to quota_error

LU-10101 tests: correct sanity-quota call to quota_error

sanity-quota test 7e calls quota_error with a "-u"
argument. Input to quota_error should not be prefaced
with  "-".

Test-Parameters: trivial testgroup=review-zfs-part-1,review-dne-part-2
Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: Iac84e3fb2348588a157beefcf4d554b1ac3171ed
Reviewed-on: https://review.whamcloud.com/29358
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Saurabh Tandan <saurabh.tandan@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>