Fix All always does the entire project, regardless of input

[333fred]

omnisharp-roslyn/src/OmniSharp.Roslyn.CSharp/Services/Refactoring/RunFixAllCodeActionService.cs

Line 81 in ed3d417

Microsoft.CodeAnalysis.CodeFixes.FixAllScope.Project,

This ignores the input fix all scope, and always runs fixers over the entire project, regardless of whether just one document is requested.

Example of the behavior:

1. Create a new WPF app with dotnet new wpf.
2. Open in vscode
3. Open Main.xaml.cs
4. Run "Fix all in document" on unused usings.

Expected:

App.xaml.cs is not touched.

Actual:

Unused usings are removed from App.xaml.cs as well.