[BUG] Set budget best height before reading budget DB during init
[BUG] Set budget best height before reading budget DB during init

Otherwise all proposals/budgets are removed by `CheckAndRemove`
(negative confirmations for collateral txes).

Introduced in #1826
PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,Darknet-Crypto/Darknet,Darknet-Crypto/Darknet,PIVX-Project/PIVX,Darknet-Crypto/Darknet,Darknet-Crypto/Darknet,Darknet-Crypto/Darknet,PIVX-Project/PIVX,PIVX-Project/PIVX,Darknet-Crypto/Darknet,PIVX-Project/PIVX