cmd/management-console: fix issue where generate Go asset file was included recursively

Created by: slimsag

Our generated asset file here accidentally included Go files, which meant it could include itself thus growing forever. This obviously was not good and caused panics in various tools due to the file being able to grow quite large (e.g. https://github.com/golang/go/issues/30121).

Luckily, this would only happen on multiple runs of dev/start.sh as we do not commit this asset file unlike our other ones :)