spec: add spec to validate decimal grade for quiz submission in speedgrader
spec: add spec to validate decimal grade for quiz submission in speedgrader

Test Plan:
- pass Jenkins
- check for syntax errors
- make sure new test_ids match up to an existing test case in TestRails

Change-Id: I3cd6cc98c0b4dbf6ffa11193902ab0165209fbc3
Reviewed-on: https://gerrit.instructure.com/64080
Tested-by: Jenkins
Reviewed-by: Derek Hansen <cb1116771307a93b98b6babf698410ed3846296d@instructure.com>
Product-Review: Derek Hansen <cb1116771307a93b98b6babf698410ed3846296d@instructure.com>
QA-Review: Derek Hansen <cb1116771307a93b98b6babf698410ed3846296d@instructure.com>

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