Revert "Hygiene: Simplify {{#eachPost}} handlebars helper"

Breaks QUnit tests apparently.
ext.flow: Handlebars helpers: Handlebars.prototype.eachPost (
Can this be amended with fixes to the QUnit tests, I'm now not
so confident about this patch.

This reverts commit 4c01934a737682317f2cb129f8426b837b3d4a53.

Change-Id: I73a8194728758e512c54c7685c832bca3a7e81d3