schema/validations followup 2

[mroz22]

followup for #10280 where we interwined api definition with runtime params validations. it uncovered couple of places where types did not match runtime.

• outputs withtout script_type
• non-change output with script_type PAYTOWITNESS which is probably not correct judging by protobuf definitions here

so far we only decided to adjust types to match bugged runtime because fixing runtime could in fact be breaking for some implementations that rely on this behaviour. we should definitely fix it either in the next major version (10) or maybe we decide to introduce a breaking change fix already into version 10