Remove icon in activity only message on smaller screen widths

Annabel Dunstone Grayrequested to merge
fix-activity-only-notice into master

This was implemented in the original MR but it must have gotten lost in the review process at some point 🤷

Before After
Screen_Shot_2019-03-12_at_6.55.53_AM Screen_Shot_2019-03-12_at_6.55.31_AM

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