Add missing cs_main lock to VerifyDB
Add missing cs_main lock to VerifyDB

Fixes issue #4139.

domob1812/crowncoin,syscoin/syscoin,Crowndev/crowncoin,Infernoman/crowncoin,domob1812/crowncoin,syscoin/syscoin,Crowndev/crowncoin,Infernoman/crowncoin,syscoin/syscoin,Infernoman/crowncoin,syscoin/syscoin,Crowndev/crowncoin,domob1812/crowncoin,Infernoman/crowncoin,syscoin/syscoin,domob1812/crowncoin,domob1812/crowncoin,domob1812/crowncoin,Crowndev/crowncoin,syscoin/syscoin,Infernoman/crowncoin,syscoin/syscoin,Crowndev/crowncoin,Infernoman/crowncoin,Crowndev/crowncoin,syscoin/syscoin