Remove membership_auto_renew from defaultReturn properties

Remove membership_auto_renew from defaultReturn properties

This field is in the defaultReturnProperties for the BAO_Query object but it's a pseudofield and as demonstrated in this PR
https://github.com/civicrm/civicrm-core/pull/14956

the ability of the [search selector](https://github.com/civicrm/civicrm-core/pull/14956/files#diff-ce8713d2ed34e1061d2b3304ec3ff6bbR69)
to determine this value is unrelated to it's presence in the Query object (which always returns an empty value as we can
see in the [export test](https://github.com/civicrm/civicrm-core/pull/14956/files#diff-4686601201fee8a8402a894c1b7df226R291)
despite contribution_recur_id being calculated (as we see a few lines earlier)