Console warning from class prop usage in SelectCard

[ssciolla]

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Expected behavior (A description of what you expected to happen) :

There should be no Web console errors or warnings when using the UI.

Describe the bug (Tell us what happens instead of the expected behavior) :

There is a warning about an invalid prop name of class (as opposed to className). I introduced this accidentally in PR #1475. The warning is suppressed in production, so there is no visible error there.

Steps to Reproduce :

1. Launch MyLA from a course, check you're on the view/visualization page.
2. Check the Web console.

[pushyamig]

I will QA this

[pushyamig]

Test Passes. I don't see the error from any views including the home page. I ran the test from latest from my local