Fix one-of property JS errors.

Introduced in:
https://pdfium-review.googlesource.com/c/pdfium/+/18271/13/xfa/fxfa/parser/cxfa_node.cpp

Bug: 872899
Change-Id: I9e71e384cd8682dd09378f0cb92ae443138a19d8
Reviewed-on: https://pdfium-review.googlesource.com/40870
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index 6b30f79..c41a1ac 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -795,7 +795,7 @@
   std::vector<CXFA_Node*> nodes;
   for (CXFA_Node* pChild = first_child_; pChild;
        pChild = pChild->next_sibling_) {
-    if (!HasProperty(pChild->GetElementType())) {
+    if (HasProperty(pChild->GetElementType())) {
       if (bFilterProperties) {
         nodes.push_back(pChild);
       } else if (bFilterOneOfProperties &&