HTML Reporter: Fix `<label>` to wrap `<select>` for multi-value urlConfig item

[Krinkle]

https://qunitjs.com/api/config/urlConfig/

Demonstrated by http://localhost:4000/test/reporter-urlparams.html fixture.

This creates consistency with how we render label/input checkboxes, and improves spacing in the design.

Before (top), After (bottom).