Mode calculation is broken in validation function

[aldro61]

WorkArena/src/browsergym/workarena/tasks/dashboard.py

Line 594 in c3db536

elif self.config["question"] == "mode":

Affects reports and dashboards. Also affects some L2/L3 tasks.

[Ayushmann13479]

I'd like to work on this issue. The current PR #96 appears to be inactive after the requested review changes. If no one is actively working on it, I'd be happy to submit an updated fix that incorporates the review feedback.