UX: Give fa-hearts more love. (PR #3627)

Follow up to UX: Seeing black hearts make me sad. by tgxworld · Pull Request #3548 · discourse/discourse · GitHub.

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@coding-horror I changed the color of the heart icon in notifications as well. Please let me know if that is ok :slight_smile:

screenshot from 2015-07-22 19 05 44

screenshot from 2015-07-22 19 10 38 screenshot from 2015-07-22 19 10 16

screenshot from 2015-07-22 23 48 17

looks good let’s try it again