Erdős Problem 796: status mismatch (repo=formally solved, erdosproblems.com=open)

The status of [Erdős problem 796](https://www.erdosproblems.com/796) appears to have changed.

- **[This repo](http://github.com/google-deepmind/formal-conjectures/blob/main/FormalConjectures/ErdosProblems/796.lean)**: `formally solved` (in `FormalConjectures/ErdosProblems/796.lean`)
- **[erdosproblems.com/796](https://www.erdosproblems.com/796)**: `open`

Please verify and update the `@[category research ...]` annotation if appropriate.

Open FormalConjectures/ErdosProblems/796.lean and inspect its @[category research ...] annotation. Verify the current status of problem 796 on erdosproblems.com, then update the annotation if the external status confirms the mismatch; done means the repository metadata matches the verified status.

Written by the indexing model from the issue text.