fix 280

[ZacLN]

Fixes julia-vscode/StaticLint.jl#280

Previously we were pushing arguments to the top expresions .args field directly, rather than using the specialised push!(expr::EXPR,item). The specialised version makes sure the parent of each item is set to expr.

For every PR, please check the following:

• End-user documentation check. If this PR requires end-user documentation in the Julia VS Code extension docs, please add that at https://github.com/julia-vscode/docs.
• Changelog mention. If this PR should be mentioned in the CHANGELOG for the Julia VS Code extension, please open a PR against https://github.com/julia-vscode/julia-vscode/blob/master/CHANGELOG.md with those changes.

[pfitzseb]

Yep, this fixes the issue.