Remove personal namespace from start up script

The personal namespace has now been deprecated. It is still available by providing rpc.enabledeprecatedpersonal flag on startup. However, it is not recommended to use these methods - use Clef instead!

$ docker exec --tty geth-node /bin/bash -c "cd /mnt/utils && ./run-tests.sh /ethereum-local-network/geth.local /mnt/t/$A_CONTRACT ${A_CONTRACT}_light_test.js"
# ***INF[run-tests.sh]: 0.4.56
# ***INF[run-tests.sh]: local PoA network </ethereum-local-network/geth.local>
# ***INF[run-tests.sh]: running test </mnt/t/PheixAuth/PheixAuth_light_test.js>
# ***INF[run-tests.sh]: waiting 120 seconds for active ethereum network
# ***INF[run-tests.sh]: network is active - found 1 peer(s)
  WARN [02-16|07:37:13.756] Enabling deprecated personal namespace 
# ***INF[run-tests.sh]: smart-contract deploy address <0x682f892ac0e1c06f2db5bc9f9b11193ed2baa046165bc2ff255d16b8fe0a3c67>
  WARN [02-16|07:37:20.909] Enabling deprecated personal namespace 
# ***INF[run-tests.sh]: TEST COMPLETED!

Refs:

1. https://geth.ethereum.org/docs/interacting-with-geth/rpc/ns-personal
2. https://geth.ethereum.org/docs/interacting-with-geth/rpc/ns-personal-deprecation
3. https://geth.ethereum.org/docs/getting-started#start-clef
4. https://github.com/ethereum/go-ethereum/blob/master/cmd/clef/tutorial.md