R1:aa6c99384879

Fix two minor points UI issues

Summary:
Ref T4427.

- When points are configured, show them on the task detail page (just a simple property, at least for now).
- Typecast points better to avoid "joe changed points from 12 to 12." beacuse we compare the stored value (as a string) to the new value (as a double).

Test Plan:
- Saw points on detail view.
- Created task with points, then edited it without touching points. No more spurious "changed from 12 to 12" transaction.

Reviewers: chad

Reviewed…