fix(slider): remove flex-grow (#16631)

Co-authored-by: Marin Popov <desig9stein@users.noreply.github.com>
Co-authored-by: Simeon Simeonoff <sim.simeonoff@gmail.com>

Author: 3 people

projects/igniteui-angular/core/src/core/styles/components/slider/_slider-theme.scss

@@ -89,7 +89,6 @@
         // https://github.com/IgniteUI/igniteui-angular/issues/11597
         z-index: 0;
         height: $slider-height;
-        flex-grow: 1;
         align-items: center;
         transition: all .2s $out-quad;
         touch-action: pan-y pinch-zoom;