PayPalProIPN doesn't check for active processors only

In PayPalProIPN.php, the api3 call to 'Payment Processor' 'getvalue' can return a disabled record. Inserting 'is_active=1, ' to the criteria would fix that.

On my system, I had an old PalPal Pro account and also created a new one. I disabled the old account, but my recurring transactions were all failing because Civi chose the old disabled account instead of the newer enabled one. I added that one line on my implementation and the problem was resolved.