Numerical input fields now handle commas properly

Numerical input commas were replaced by a period on parsing
automatically. This change prevents the improper parsing of these
values.

Fixes CNVS-1607

Test Plan:
  - Generate a quiz
  - Generate quiz questions with numerical input fields (numerical and
    formula question types)
  - Confirm valid input for numbers which include comma separators
  - Regression test for negative values, multiple commas, decimal inputs
  - Take quiz
  - Confirm same behaviors on the take_quiz side.

Change-Id: I642c21f23df8f90a5aaee859a65811041b4644ee
Reviewed-on: https://gerrit.instructure.com/40382
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Ahmad Amireh <ahmad@instructure.com>
QA-Review: Trevor deHaan <tdehaan@instructure.com>
Product-Review: Ryan Taylor <rtaylor@instructure.com>