net: reference instead of copy in BlockConnected range loop
net: reference instead of copy in BlockConnected range loop

to fix -Wrange-loop-analysis warning introduced in a029e18


Former-commit-id: 7c161ab51b3991626cbea40ef7c2d4be5856c95f
syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2