fix(issues): Fix title of unlabeled errors (#69195)

Relates to INC721.

static/app/utils/events.tsx

@@ -130,7 +130,7 @@ export function getTitle(
 
   switch (type) {
     case EventOrGroupType.ERROR: {
-      if (customTitle) {
+      if (customTitle && customTitle !== '<unlabeled event>') {
         return {
           title: customTitle,
           subtitle: culprit,