This PR resolves the bug that shows assignment's weighted grades that do not sum to the correct total grade. When a learner's weighted grades round down to the nearest whole number, but the summation of the weighted grades will round to a higher percent than the pre-rounded summation. To clarify this for users, the assignment's weighted grade will now show 2 decimal points, matching the legacy display found in the grade graph. To further clarify the difference, a tooltip was added to show the learner the raw weighted grade and the rounded weighted grade.
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