Negative quiz group question points
Negative quiz group question points

Fixes CNVS-19918

Test Plan
 - User should not be able to create quiz group with negative question points

Change-Id: Iff7dd1b8ca952a2fc1e7b81350dfb73b8d308939
Reviewed-on: https://gerrit.instructure.com/57146
Reviewed-by: Ryan Taylor <2eafa1f6bf34395b543d6ca7f438461b0774d24f@instructure.com>
Tested-by: Jenkins
QA-Review: Michael Hargiss <59e3fde81b8d9a4f5e0cc016a3c2695591912604@instructure.com>
Product-Review: Jason Sparks <542e620f0c6c3447ce6e2e8c83a97102b99f89c6@instructure.com>

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