Address review comment

Author: hvitved

csharp/ql/lib/semmle/code/csharp/dataflow/FlowSummary.qll

@@ -169,7 +169,7 @@ private SummaryComponent delegateSelf() {
 private predicate mayInvokeCallback(Callable c, int n) {
   c.getParameter(n).getType() instanceof SystemLinqExpressions::DelegateExtType and
   not c.hasBody() and
-  (if c instanceof AddEventAccessor then not c.fromSource() else any())
+  (if c instanceof Accessor then not c.fromSource() else any())
 }
 
 private class SummarizedCallableWithCallback extends SummarizedCallable {

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

@@ -314,7 +314,7 @@ private module CallGraph {
         target = c.getTarget() and
         not target.hasBody()
       |
-        if target instanceof AddEventAccessor then not target.fromSource() else any()
+        if target instanceof Accessor then not target.fromSource() else any()
       ) and
       e = c.getAnArgument() and
       e.getType() instanceof SystemLinqExpressions::DelegateExtType and