unified: Exclude UnqualifiedMemberAccess in fallback

UnqualifiedMemberAccess is only populated when static name binding
positively identifies the resolution target, so either the first case
catches it, and if unresolved, the second case will miss it anyway
because it won't be a MemberAccess instance.

Author: asgerf

unified/ql/lib/codeql/unified/internal/dataflow/DataFlowCall.qll

@@ -12,7 +12,8 @@ private newtype TDataFlowCall =
     (
       N::getStaticBindingTargetFromRef(expr) = any(GetterDeclaration g).getNameNode()
       or
-      expr instanceof MemberAccess
+      // Assume a qualified member accesses might resolve to a getter.
+      expr instanceof MemberAccessExpr
     )
   } or
   TSetterCall(Expr expr) {
@@ -26,7 +27,8 @@ private newtype TDataFlowCall =
     (
       N::getStaticBindingTargetFromRef(expr) = any(SetterDeclaration g).getNameNode()
       or
-      expr instanceof MemberAccess
+      // Assume a qualified member accesses might resolve to a setter.
+      expr instanceof MemberAccessExpr
     )
   } or
   TSummaryCall(SummarizedCallable callable, SummaryNode callee) {