Ensure we pass through the AnalyzerConfigOptionsProvider

Without this, the AnalyzerOptions we get from a Project that does
support AnalyzerConfig settings won't be used when running IDE
analyzers.

src/Features/Core/Portable/Diagnostics/WorkspaceAnalyzerOptions.cs

@@ -18,7 +18,7 @@ internal sealed class WorkspaceAnalyzerOptions : AnalyzerOptions
         private readonly OptionSet _optionSet;
 
         public WorkspaceAnalyzerOptions(AnalyzerOptions options, OptionSet optionSet, Solution solution)
-            : base(options.AdditionalFiles)
+            : base(options.AdditionalFiles, options.AnalyzerConfigOptionsProvider)
         {
             _solution = solution;
             _optionSet = optionSet;