Change 'Update'-button visibility on change qty event.

[likemusic]

Description

When qty value in minicat updated by js, Update-button should have the same behavior like when qty is manually edited.

Fixed Issues (if relevant)

Manual testing scenarios

1. jQuery('.cart-item-qty:first').val(parseFloat(jQuery('.cart-item-qty:first').val()) - 1).change(); - Update button should be shown.
2. jQuery('.cart-item-qty:first').val(parseFloat(jQuery('.cart-item-qty:first').val()) - 1).change(); - Update button should be hidden.

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)

[VladimirZaets]

Hi @likemusic , I took your PR into processing, thank you for collaboration.

[magento-engcom-team]

Hi @likemusic. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.2.5 release.