remove inline unprefixed flex for safari 8 compatability

resources/frontend_client/app/components/UserAvatar.react.js

@@ -13,9 +13,6 @@ export default class UserAvatar extends Component {
             borderRadius: '99px',
             width: '2rem',
             height: '2rem',
-            display: 'flex',
-            alignItems: 'center',
-            justifyContent: 'center',
         }
     }
     userInitials() {
@@ -57,4 +54,4 @@ UserAvatar.defaultProps = {
 UserAvatar.propTypes = {
     background: PropTypes.string,
     user: PropTypes.object.isRequired
-}
\ No newline at end of file
+}