C#: Fix issue with summaryElement predicate.

Author: michaelnebel

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

@@ -96,9 +96,7 @@ DataFlowType getCallbackReturnType(DataFlowType t, ReturnKind rk) {
  * `input`, output specification `output`, kind `kind`, and a flag `generated`
  * stating whether the summary is autogenerated.
  */
-predicate summaryElement(
-  SummarizedCallable c, string input, string output, string kind, boolean generated
-) {
+predicate summaryElement(Callable c, string input, string output, string kind, boolean generated) {
   exists(
     string namespace, string type, boolean subtypes, string name, string signature, string ext
   |