`contents`  broken for Go in latest released ksc v0.8
Trying to compile a `.ksy` that has a fixed `contents` field using `ksc --target all` or `ksc --target go` fails due to some issue with the go compiler.

Example `broken_go.ksy`:

```yaml
meta:
  id: broken_go
seq:
  - id: magic
    contents: [0x44, 0x42, 0x2F]
```

Compiler output:

```console
> ksc --version
kaitai-struct-compiler 0.8
> ksc --target go broken_go.ksy --verbose file
parsing broken_go.ksy...
reading broken_go.ksy...
... compiling it for go... 
List(ArraySeq(IntNum(68), IntNum(66), IntNum(32))) (of class io.kaitai.struct.exprlang.Ast$expr$List)
```