[BB-933] Change `contentType` with `icon` for unit buttons

Description

This PR is a part of edx/edx-platform#21433. As the learning UI is being moved to MFE, we ported the LMS frontend changes here.

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Marco Morales
June 10, 2020, 3:58 AM

Stumbled across this. No product concerns, in case this comes up we can skip that step.

Won't Do

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Open Source Pull Request Bot

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Contributor Name

Piotr Surowiec

Repo

edx/frontend-app-learning

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