Fix case of modifier reorder with leading trivia

[marcus-cellavision]

Description

Formatting our code base I ran into a validation issue regarding the following code

namespace Models
{
    public class OrderListItemModel : BindableBase
    {
        // foobar
        override public int GetHashCode() => 67;
    }
}

The issue being when the modifiers are reordered the leading trivia // foobar is associated with a different modifier.

I had a go at fixing this issue.

Related Issue

n/a

Checklist

• My code follows the project's code style
  • always var
  • follow existing naming conventions
  • always this.
  • no pointless comments
• I will not force push after a code review of my PR has started
• I have added tests that cover my changes

[belav]

Looks good! Thanks for contributing the fix