rpc: use snake_case for 'protx_list' verbose response json keys.
rpc: use snake_case for 'protx_list' verbose response json keys.

PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX