Minor code quality improvements

Author: tamasvajk

csharp/extractor/Semmle.Extraction/Entities/GeneratedLocation.cs

@@ -28,7 +28,7 @@ public override void WriteId(TextWriter trapFile)
 
         public override bool Equals(object? obj) => obj != null && obj.GetType() == typeof(GeneratedLocation);
 
-        public static GeneratedLocation Create(Context cx) => GeneratedLocationFactory.Instance.CreateEntity(cx, typeof(GeneratedLocation), null);
+        public static new GeneratedLocation Create(Context cx) => GeneratedLocationFactory.Instance.CreateEntity(cx, typeof(GeneratedLocation), null);
 
         private class GeneratedLocationFactory : ICachedEntityFactory<string?, GeneratedLocation>
         {

csharp/extractor/Semmle.Extraction/Entities/Location.cs

@@ -20,7 +20,6 @@ public static Location Create(Context cx)
             return cx.SourceTree == null
                 ? GeneratedLocation.Create(cx)
                 : Create(cx, Microsoft.CodeAnalysis.Location.Create(cx.SourceTree, TextSpan.FromBounds(0, 0)));
-
         }
 
         public override Microsoft.CodeAnalysis.Location? ReportingLocation => symbol;