Summary:
When access rules are in effect on a document, non-owners currently
don't have access to snapshots. Previously when the document history
tab is opened in this situation, an error toast would appear, along
with a small message that was hard to see in dark mode. This change
removes the toast and improves the message somewhat.
Test Plan: updated test
Reviewers: jarek
Reviewed By: jarek
Differential Revision: https://phab.getgrist.com/D4218