C#: Remove un-needed code as we extract synthetic default constructors.

csharp/ql/lib/semmle/code/csharp/dataflow/internal/DataFlowDispatch.qll

@@ -20,13 +20,7 @@ private import semmle.code.csharp.frameworks.system.collections.Generic
  */
 DotNet::Callable getCallableForDataFlow(DotNet::Callable c) {
   exists(DotNet::Callable unboundDecl | unboundDecl = c.getUnboundDeclaration() |
-    (
-      result.hasBody()
-      or
-      // take synthesized bodies into account, e.g. implicit constructors
-      // with field initializer assignments
-      result = any(ControlFlow::Nodes::ElementNode n).getEnclosingCallable()
-    ) and
+    result.hasBody() and
     if unboundDecl.getFile().fromSource()
     then
       // C# callable with C# implementation in the database