[#1514] Update PropType for ActionStrip.icon

Author: catarak

client/components/mobile/ActionStrip.jsx

@@ -38,7 +38,7 @@ const ActionStrip = ({ actions }) => (
 
 ActionStrip.propTypes = {
   actions: PropTypes.arrayOf(PropTypes.shape({
-    icon: PropTypes.any, //eslint-disable-line
+    icon: PropTypes.component,
     aria: PropTypes.string.isRequired,
     action: PropTypes.func.isRequired,
     inverted: PropTypes.bool