Fix spending for v1 zPIV created before block 1050020.
Fix spending for v1 zPIV created before block 1050020.

The transition to v2 zPIV and reset of the accumulators caused blocks 1050000 - 1050010 to be accumulated twice. This was causing many v1 zPIV to not create valid witnesses. This problem is fixed by double accumulating blocks 1050000-1050010 when creating the witness.

PIVX-Project/PIVX,Mrs-X/Darknet,Mrs-X/Darknet,Mrs-X/PIVX,benzmuircroft/REWIRE.io,Mrs-X/PIVX,PIVX-Project/PIVX,npccoin/npccoin,benzmuircroft/REWIRE.io,npccoin/npccoin,PIVX-Project/PIVX,npccoin/npccoin,Mrs-X/PIVX,Darknet-Crypto/Darknet,PIVX-Project/PIVX,PIVX-Project/PIVX,benzmuircroft/REWIRE.io,Darknet-Crypto/Darknet,benzmuircroft/REWIRE.io,npccoin/npccoin,npccoin/npccoin,Mrs-X/PIVX,PIVX-Project/PIVX,benzmuircroft/REWIRE.io,Darknet-Crypto/Darknet,Mrs-X/PIVX,PIVX-Project/PIVX,Darknet-Crypto/Darknet,Mrs-X/Darknet,npccoin/npccoin,Mrs-X/Darknet,PIVX-Project/PIVX,Mrs-X/Darknet,Darknet-Crypto/Darknet,Darknet-Crypto/Darknet,PIVX-Project/PIVX,Mrs-X/Darknet,benzmuircroft/REWIRE.io,Mrs-X/PIVX