fix for NotificationGroup missing key

real notifications (from reducer) doesn't have "key" field so it needs to be created dynamically

src/components/notifications/Context/components/Action/components/NotificationsGroups/components/Group/index.js

@@ -108,7 +108,7 @@ Group.propTypes = {
     close: PropTypes.func.isRequired,
     groupNotifications: PropTypes.arrayOf(
         PropTypes.shape({
-            key: PropTypes.number,
+            key: PropTypes.object,
             type: PropTypes.string,
             title: PropTypes.string,
             message: PropTypes.string,

src/components/notifications/Context/components/Action/components/NotificationsGroups/index.js

@@ -2,7 +2,6 @@ import React, { Component } from 'react';
 import styled from 'styled-components';
 import PropTypes from 'prop-types';
 
-import { PRIORITY } from 'constants/notifications';
 import Group from './components/Group';
 
 const Wrapper = styled.div``;
@@ -14,7 +13,7 @@ class NotificationsGroup extends Component {
             if (!acc[key]) {
                 acc[key] = [];
             }
-            acc[key].push(obj);
+            acc[key].push({ ...obj, key: obj });
             return acc;
         }, {});