Fix 'event is not defined' exception in onClick handler

Change-Id: If1bb8c68a373b4104cb8c3ac638357a5092e8237
diff --git a/src/main/resources/static/find-owners.js b/src/main/resources/static/find-owners.js
index 4f3522f..c773aa9 100644
--- a/src/main/resources/static/find-owners.js
+++ b/src/main/resources/static/find-owners.js
@@ -577,7 +577,7 @@
     changeActions.addTapListener(actionKey,
         () => popupFindOwnersPage(null, change, revision, false));
   }
-  function onClick(e) {
+  function onClick(event) {
     if (pageDiv.style.visibility != 'hidden' && !useContextPopup) {
       var x = event.clientX;
       var y = event.clientY;