Summary:
In Access Rules, Save button didn't update until clicking-away from
formula editor; this sometimes feels buggy. Instead, when editing
formula, update state automatically after a 1-second delay.
https://gristlabs.getgrist.com/doc/check-ins/p/5#a1.s9.r1798.c24
Test Plan: Adds new nbrowser test
Reviewers: georgegevoian
Reviewed By: georgegevoian
Differential Revision: https://phab.getgrist.com/D3707