Fix Issue 19822 - 2.086 regression wrt. union initializers

[RazvanN7]

The array checks should be grouped together as the initial condition was:

 if (structlit &&
    ((e.op == TOK.void_) ||
     (e.op == TOK.arrayLiteral && e.type.ty == Tsarray && isEntirelyVoid((cast(ArrayLiteralExp)e).elements)) ||
     (e.op == TOK.structLiteral && isEntirelyVoid((cast(StructLiteralExp)e).elements))))

[dlang-bot]

Thanks for your pull request and interest in making D better, @RazvanN7! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
Please verify that your PR follows this checklist:

• My PR is fully covered with tests (you can see the annotated coverage diff directly on GitHub with CodeCov's browser extension
• My PR is as minimal as possible (smaller, focused PRs are easier to review than big ones)
• I have provided a detailed rationale explaining my changes
• New or modified functions have Ddoc comments (with Params: and Returns:)

Please see CONTRIBUTING.md for more information.

---

If you have addressed all reviews or aren't sure how to proceed, don't hesitate to ping us with a simple comment.

Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	19822	regression	2.086 regression wrt. union initializers

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub fetch digger
dub run digger -- build "stable + dmd#9730"