Summary:
Plotly sorts pie charts sectors by default and that is overiding the
section ordering. This diff fixes that by passing setting .sort to
false (thus disabling reordering) when there is a sort spec going on.
Issue was reported by user: https://gristlabs.getgrist.com/k1f3bMzUvitZ/User-Feedback#a1.s3.r333.c19
Test Plan: Added nbrowser test
Reviewers: paulfitz
Reviewed By: paulfitz
Differential Revision: https://phab.getgrist.com/D3075