Fix erroneous newline

Author: Saalvage

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -647,7 +647,7 @@ public override bool VisitPointerType(PointerType pointer, TypeQualifiers quals)
                     if (pointer.Pointee.IsTemplateParameterType())
                         Context.Before.Write($"(({Context.Parameter.Type}) (object) {Context.Parameter.Name})");
                     else
-                        Context.Before.WriteLine(Context.Parameter.Name);
+                        Context.Before.Write(Context.Parameter.Name);
                     Context.Before.WriteLine($".{Helpers.InstanceIdentifier};");
 
                     Context.Return.Write($"new {typePrinter.IntPtrType}(&{arg})");