Wallet new generates keys with incorrect length

[MujkicA]

https://github.com/FuelLabs/fuels-rs/issues/1289

The above issue on the Rust SDK led me to discover that we provide eth_keystore::encrypt_key with a mnemonic to be used as pk here:

https://github.com/FuelLabs/forc-wallet/blob/4d5fa8b1214df6bcad9b31dbef571a67af70da8f/src/utils.rs#L129

which leads to variable length keys being generated instead of the expected 32 bytes.

[mtroym]

Thanks Mujica