fix(switch): invalid container margin in RTL (angular#9586)

* The switch does not properly display in RTL mode - this is due to the recent changes to the RTL mixin, which introduced a reset value.
* Inside of the switch the container should have a 0px reset value

src/components/switch/switch.scss

@@ -44,7 +44,7 @@ md-switch {
     height: $switch-height;
     position: relative;
     user-select: none;
-    @include rtl-prop(margin-right, margin-left, 8px, auto);
+    @include rtl-prop(margin-right, margin-left, 8px, 0px);
     float: left;
   }