Fix click event handler on button within slide element

[sarmeyer]

Description

This PR fixes the click event handler for buttons that are within the slide elements. Clicking a button was firing the handleSwipe method, when it should only fire it's own onClick handler. By checking onMouseUp if there is a direction on the click event, we can avoid unnecessary swipe method calls.

Fixes #462

Type of Change

• [x ] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Add a button to the slides with an onClick handler that changes the slideIndex

Checklist: (Feel free to delete this section upon completion)

• [x ] My code follows the style guidelines of this project (I have run yarn lint)
• [ x] New and existing unit tests pass locally with my changes (I have run yarn test and yarn test-e2e)
• [ x] I have performed a self-review of my own code
• [ x] My changes generate no new warnings