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

Fixes issue #4139.

jarymoth/dogecoin,koharjidan/dogecoin,haisee/dogecoin,coinwarp/dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,coinwarp/dogecoin,jarymoth/dogecoin,jarymoth/dogecoin,langerhans/dogecoin,marklai9999/Taiwancoin,Exceltior/dogecoin,langerhans/dogecoin,marklai9999/Taiwancoin,brishtiteveja/sherlockcoin,koharjidan/dogecoin,koharjidan/dogecoin,Domer85/dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,marklai9999/Taiwancoin,marklai9999/Taiwancoin,Domer85/dogecoin,Exceltior/dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,Domer85/dogecoin,brishtiteveja/sherlockcoin,coinwarp/dogecoin,haisee/dogecoin,langerhans/dogecoin,jarymoth/dogecoin,brishtiteveja/sherlockcoin,Exceltior/dogecoin,koharjidan/dogecoin,coinwarp/dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,coinkeeper/2015-06-22_18-37_dogecoin,brishtiteveja/sherlockcoin,koharjidan/dogecoin,haisee/dogecoin,langerhans/dogecoin,langerhans/dogecoin,coinwarp/dogecoin,koharjidan/dogecoin,Domer85/dogecoin,haisee/dogecoin,Exceltior/dogecoin,langerhans/dogecoin,brishtiteveja/sherlockcoin,jarymoth/dogecoin,haisee/dogecoin,Exceltior/dogecoin