[Frontend] Mods to slider .range-value elems

open #889
- Text smaller, line breaks;
- Height adjustments
- Increased with of slider area;

platform/commonUI/general/res/sass/controls/_controls.scss

@@ -404,11 +404,11 @@ body.desktop .object-header {
         left: auto;
     }
     .knob-l {
-        @include border-left-radius($sliderKnobW);
+        @include border-left-radius($sliderKnobR);
         cursor: w-resize;
     }
     .knob-r {
-        @include border-right-radius($sliderKnobW);
+        @include border-right-radius($sliderKnobR);
         cursor: e-resize;
     }
     .range {