Fixes small number rounding issue formula questions
Fixes small number rounding issue formula questions

fixes CNVS-22981

test plan:
- Create a Formula question which uses 1 decimal place
- Use a set of numbers which would generate a two decimal
  answer ending in a 5
- Ensure that number rounds as expected

Change-Id: Id8bcd017795b85b60636bcc0d202b55ad74b3bdf
Reviewed-on: https://gerrit.instructure.com/63706
Tested-by: Jenkins
Reviewed-by: Brian Finney <6d3e3f1a68388efca72d0ac9c9ecbc1039d2a9c2@instructure.com>
QA-Review: Deepeeca Soundarrajan <5bcd4b623f00b7fc2942cd1c65c245b30a48a61f@instructure.com>
Product-Review: Jason Sparks <542e620f0c6c3447ce6e2e8c83a97102b99f89c6@instructure.com>

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