Update Cronjobs/a2billing_autorefill.php

Modified WHERE selection to autorefill=1 AND ((typepaid=0 AND initialbalance>0 AND credit<initialbalance) OR (typepaid=1)) to allow selection of post-paid cards with autorefill
Merge pull request #30 from cmpcs/patch-1

Update Cronjobs/a2billing_autorefill.php
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