limit question group points to a scale of 2
limit question group points to a scale of 2

fixes CNVS-11641
Quiz questions are limited to a scale of 2 in the UI (numbers after the
decimal). Question groups allowed more scale, they have now been limited
to 2 as well.

- As a teacher, create a quiz
- Create a question group, and attempt to add a point total of 2.12345
- It should round to 2.12
- Create a question group, and attempt to add a point total of 2.34999
- It should round to 2.35

Change-Id: Ic3e54b3e62bd7b99f51002cb14bf4854d650023a
Reviewed-on: https://gerrit.instructure.com/32332
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Myller de Araujo <e5c7c5e1b7f2ce5e9870cc98ec52b20b3006cb48@instructure.com>
Reviewed-by: Derek DeVries <ff87a0776152510efd53bb1f4ea089dbbc90e730@instructure.com>
Product-Review: Josh Simpson <bfb4987b134a00f73d881fff5113b1d5fa1876bc@instructure.com>

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