ErrCreateFailed always return internal error

[toml01]

https://github.com/CosmWasm/wasmd/blob/master/x/wasm/internal/types/errors.go#L12

Seems like Cosmos SDK overrides any error with code 1 with internal error.
cosmos/cosmos-sdk#6916

A quick fix would be to just change the code for ErrCreateFailed I guess.

[toml01]

https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules/errors.md#registration

Must be greater than one, as a code value of one is reserved for internal errors.

[ethanfrey]

Yes, let us bump all the error codes by one in the next (post 0.10) release