ZkSync driver: updated mainnet fund message

[Wiezzel]

Your mainnet zkSync address is 0x74d3b4a355374afe7c5bc8ffbb650ae308a16a49.

To fund your wallet and be able to pay for your activities on Golem head to
the https://chat.golem.network, join the #funding channel and type /terms
and follow instructions to request GLMs.

Mind that to be eligible you have to run your app at least once on testnet -
- we will verify if that is true so we can avoid people requesting "free GLMs".