fix(material-experimental/mdc-slider): disable mat ripple

* Disable the mat ripple on the slider thumbs to prevent the automatic launch that happens on click/touch.
  The problem is easily reproduced if you undo this change and test it out on a mobile device.

Author: wagnermaciel

src/material-experimental/mdc-slider/slider-thumb.html

@@ -4,4 +4,4 @@
   </div>
 </div>
 <div class="mdc-slider__thumb-knob" #knob></div>
-<div matRipple></div>
+<div matRipple [matRippleDisabled]="true"></div>