mnsync: drop regtest-only "quick sync" mode (#4824)
mnsync: drop regtest-only "quick sync" mode (#4824)


thelazier/dash,UdjinM6/dash,thelazier/dash,thelazier/dash,UdjinM6/dash,thelazier/dash,dashpay/dash,UdjinM6/dash,UdjinM6/dash,dashpay/dash,dashpay/dash,dashpay/dash,UdjinM6/dash,dashpay/dash,thelazier/dash