Fix encoding of Bk2MnemonicLookup.cs and add trailing comma

fixes 243bf80

Author: YoshiRulz

src/BizHawk.Emulation.Common/Base Implementations/Bk2MnemonicLookup.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Diagnostics;
 
 using BizHawk.Common;
@@ -1036,8 +1036,8 @@ public static string LookupAxis(string button, string systemId)
 				["Mouse Position X"] = "mpX",
 				["Mouse Position Y"] = "mpY",
 				["Mouse Speed X"] = "msX",
-				["Mouse Speed Y"] = "msY",
-			}
+				["Mouse Speed Y"] = "msY",
+			},
 		};
 
 		static Bk2MnemonicLookup()