Update run_service.sh - improved message for required funds

[jmoreira-valory]

Updated a clearer message when funds are required in a certain address. Example:

Your agent instance's address: 0x00000000000000000000000000000000000000001
Your service's Safe address: 0x00000000000000000000000000000000000000002

Checking balance of agent instance's address (minimum required 0.0500 DAI):
  - Address: 0x00000000000000000000000000000000000000001
  - Balance: 0.0509 DAI
    OK.

Checking balance of service Safe's address (minimum required 0.5000 DAI):
  - Address: 0x00000000000000000000000000000000000000002
  - Balance: 0.4900 DAI

    Please, fund address 0x00000000000000000000000000000000000000002 with at least 0.5000 DAI.
    Waiting...   

  - Updated balance: 0.5000 DAI
    OK.

Detected an existing build. Using this one...
rm: cannot remove 'abci_build/nodes/node0/config/addrbook.json': Permission denied