fix(slide-toggle): ripple fade-in too slow (#3170)

Author: devversion

src/lib/slide-toggle/slide-toggle.html

@@ -12,8 +12,7 @@
         <div class="mat-slide-toggle-ripple" md-ripple
              [mdRippleTrigger]="label"
              [mdRippleCentered]="true"
-             [mdRippleDisabled]="disableRipple || disabled"
-             [mdRippleSpeedFactor]="0.3">
+             [mdRippleDisabled]="disableRipple || disabled">
         </div>
       </div>
     </div>