RegTest sh script: remove enable of 2 deprecated RPC features
RegTest sh script: remove enable of 2 deprecated RPC features

* `-rpcserialversion=0` not needed since bitcoinj added SegWit support
* `-deprecatedrpc=generate` not needed since ConsensusJ/OmniJ started
   using `generatetoaddress` when mining.
OmniLayer/OmniJ,OmniLayer/OmniJ,OmniLayer/OmniJ