fix(range): increase MD horizontal padding (#16312)

This increases the horizontal padding on Material Design
range to prevent clipping within item.

core/src/components/range/range.md.vars.scss

@@ -7,7 +7,7 @@
 $range-md-padding-vertical:                  8px !default;
 
 /// @prop - Padding start/end of the range
-$range-md-padding-horizontal:                8px !default;
+$range-md-padding-horizontal:                14px !default;
 
 /// @prop - Height of the range slider
 $range-md-slider-height:                     42px !default;