Fix one more location with an explicit cast

src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/Options/EditorConfig/EditorConfigStorageLocation`1.cs

@@ -9,6 +9,7 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using Microsoft.CodeAnalysis.CodeStyle;
 using Roslyn.Utilities;
 
 #if CODE_STYLE
@@ -104,6 +105,18 @@ string IEditorConfigStorageLocation2.GetEditorConfigString(object? value, Option
             => $"{KeyName} = {((IEditorConfigStorageLocation2)this).GetEditorConfigStringValue(value, optionSet)}";
 
         string IEditorConfigStorageLocation2.GetEditorConfigStringValue(object? value, OptionSet optionSet)
-            => GetEditorConfigStringValue((T)value!, optionSet);
+        {
+            T typedValue;
+            if (value is ICodeStyleOption codeStyleOption)
+            {
+                typedValue = (T)codeStyleOption.AsCodeStyleOption<T>();
+            }
+            else
+            {
+                typedValue = (T)value;
+            }
+
+            return GetEditorConfigStringValue(typedValue!, optionSet);
+        }
     }
 }