[mint server] increase max mint amount. Format code with pep8
[mint server] increase max mint amount. Format code with pep8

bring mint amount closer to hard limit which is 18.5 trillion libras
also format code with linter

libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core