fix(Slider): fix JS error by dragging out of browser viewport (#1360)
fix(Slider): fix JS error by dragging out of browser viewport (#1360)

Fixes #1295.
carbon-design-system/carbon-components,carbon-design-system/carbon-components,joshblack/carbon-components-react,carbon-design-system/carbon-components,carbon-design-system/carbon-components-react,joshblack/carbon-components-react,carbon-design-system/carbon-components-react