Fixing bug in Result<T> when T is a primitive that requires modification in the Kotlin code generation

[emarteca]

The modification applied to primitives when returned as a result were specified in the wrong order in the Kotlin code generation.

For example, the following Rust:

pub fn test() -> Result<u32, ()> {
    todo!()
}

Generated the following Kotlin, with the bug specified with a comment:

      fun test(): Res<UInt, Unit> {
            val returnVal = lib.Why_test();
            if (returnVal.isOk == 1.toByte()) {
                return returnVal.union.ok.ok().toUInt() // THIS IS A BUG
            } else {
                return Err(Unit)
            }
        }

The buggy line should actually be return (returnVal.union.ok.toUInt()).ok() . This CL fixes the bug, for u32 and for all other primitives that require modification on return as a Res in Kotlin.

[emarteca]

@jcrist1