md-switch: Shows text selection cursor while pulling on desktop

`md-switch` needs either `cursor: grab` or `cursor: ew-resize` while you pull it back and forth on desktop. Right now it shows the text selection cursor when you are pulling(click and hold then move abit to see it) it.

Heres the [demo](https://material.angularjs.org/#/demo/material.components.switch) page to see it
