Enable MEN011 and fix noncompliance

"Align using directives"; this file had 2 BOM chars for some reason

Common.ruleset

@@ -19,9 +19,6 @@
 		<!-- Use the preferred exception type -->
 		<Rule Id="MEN009" Action="Hidden" />
 
-		<!-- Align using directives -->
-		<Rule Id="MEN011" Action="Hidden" />
-
 		<!-- Flags should be powers of two -->
 		<Rule Id="MEN012" Action="Hidden" />
 

src/BizHawk.Emulation.Common/Base Implementations/CodeDataLog.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Runtime.InteropServices;