Include `Drips.sol` when calculating the circulating supply

[nya-elimu]

Exclude the tokens locked to the zero address in Drips.sol when calculating the circulating supply.

https://etherscan.io/address/0xd0dd053392db676d57317cd4fe96fc2ccf42d0b4

Call the splittable function with accountId 0 (for the zero address).

[nya-elimu]

ABI: https://github.com/drips-network/sdk/blob/main/src/abi/Drips.json