Make PublicKey.createWithSeed (js) same as create_with_seed in runtime to avoid confusion

[mcf-rocks]

SystemProgram CreateAccountWithSeed instruction was failing sometimes, because seed too long.

Here ./sdk/src/pubkey.rs which is used here ./runtime/src/system_instruction_processor.rs

Javascript func doesn't care about seed length https://solana-labs.github.io/solana-web3.js/file/src/publickey.js.html#lineNumber82

So you think it's good, but then the runtime does nothing (nothing reported in logs either)

Suggest: make js function same as runtime, with error if seed too long.