Homestyx hydra

R1:b69174a4c8f7

Remove non-operational `shouldHideFromFeed()` from ManiphestTaskPointsTransaction

Summary:
See D18018. Ref T12787. This doesn't actually work; we started publishing these stories as a side effect of converting to ModularTransactions, then I fixed the rendering.

This mechanism has very few callsites and I suspect we may want to get rid of it (see T12787) so just keep publishing these stories for now.

Test Plan: Changed the point value of a task, saw a feed story both before and after the patch.
Repository: R1 hydra
Commit Date: Jun 1 2017