Bugfix/13327 ui active state not removed from previous menu item

[arnoudhgz]

Description

Previously when a menu item was expanded the class ui-state-active was
not removed from the previous expanded menu item. This resulted in two
(or more if you expanded more) menu items with this class.

Fixed Issues (if relevant)

1. Menu ui-state-active not removed from previous opened menu item #13327 Menu ui-state-active not removed from previous opened menu item

Manual testing scenarios

1. Get a clean install with sampledata
2. In your browser switch to mobile view so you have the mobile menu
3. Open the menu
4. Expand the menu item Women
5. Now expand the menu item Men
6. See that the ui-state-active class is removed from Women

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[arnoudhgz]

@okorshenko Now created the PR on the magento/magento2 repository. We normally do an internal check at @mediact first.