chor(grid): remove commented code

Author: desig9stein

projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss

@@ -2085,10 +2085,6 @@
         .sort-icon {
             color: var-get($theme, 'header-selected-text-color');
 
-	        //> igx-icon {
-		    //    color: inherit;
-	        //}
-
             ::after {
                 background: var-get($theme, 'header-selected-background');
             }