Merge pull request #714 from calumgrant/cs/event-accessors

C#: Fix extraction error when Event accessors are ordinary methods

csharp/extractor/Semmle.Extraction.CSharp/Entities/Event.cs

@@ -33,10 +33,10 @@ namespace Semmle.Extraction.CSharp.Entities
             var remover = symbol.RemoveMethod;
 
             if (!(adder is null))
-                EventAccessor.Create(Context, adder);
+                Method.Create(Context, adder);
 
             if (!(remover is null))
-                EventAccessor.Create(Context, remover);
+                Method.Create(Context, remover);
 
             ExtractModifiers();
             BindComments();