[C#] Remove superfluous semicolon in C# structs (#6791)

Aims to resolve #6788

-Remove superfluous semicolon in C# structs

tests/MyGame/Example/ArrayTable.cs

diff --git a/tests/MyGame/Example/ArrayTable.cs b/tests/MyGame/Example/ArrayTable.cs
index f622df5..9dc3d45 100644
--- a/tests/MyGame/Example/ArrayTable.cs
+++ b/tests/MyGame/Example/ArrayTable.cs
@@ -44,7 +44,7 @@
     AddA(builder, MyGame.Example.ArrayStruct.Pack(builder, _o.A));
     return EndArrayTable(builder);
   }
-};
+}
 
 public class ArrayTableT
 {