fix display of 4-digit numbers in account analytics labels
fix display of 4-digit numbers in account analytics labels

analytics already converted 1234 to "1,234", before g/100702
tried to do so again using `I18n.n`. undo that earlier
conversion and let the I18n-ready code do it instead.

test plan: ensure 4-digit numbers can be displayed in
account analytics.  you can create 1000 assignments in a course
via the console as follows:

c = Course.find(id)
1000.times { |n| c.assignments.create! title: "Assignment #{n}" }

fixes CNVS-35562

Change-Id: Id936853bc8c6d3423f603f968a0bdd9bb3aa0b95
Reviewed-on: https://gerrit.instructure.com/104836
Reviewed-by: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
Tested-by: Jenkins
QA-Review: Pedro Fajardo <121b528f0c2f2e923ce3103793aca31b9a662ac4@instructure.com>
Product-Review: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>

instructure/analytics,SwinburneOnline/canvas-analytics,instructure/analytics,instructure/analytics,SwinburneOnline/canvas-analytics,SwinburneOnline/canvas-analytics