chore: use file-scoped namespace

src/Shared/Microsoft.Windows.Shell/Standard/MF.cs

@@ -1,14 +1,13 @@
 using System;
 
-namespace Standard
+namespace Standard;
+
+[Flags]
+internal enum MF : uint
 {
-    [Flags]
-    internal enum MF : uint
-    {
-        DOES_NOT_EXIST = 4294967295u,
-        ENABLED = 0u,
-        BYCOMMAND = 0u,
-        GRAYED = 1u,
-        DISABLED = 2u
-    }
-}
+    DOES_NOT_EXIST = 4294967295u,
+    ENABLED = 0u,
+    BYCOMMAND = 0u,
+    GRAYED = 1u,
+    DISABLED = 2u
+}