build(calendar): fix sass linting errors

Author: simeonoff

projects/igniteui-angular/src/lib/core/styles/components/calendar/_calendar-theme.scss

@@ -433,7 +433,6 @@
         color: --var($theme, 'content-text-color');
         cursor: pointer;
         outline: none;
-        flex-basis: 14.28%;
         // transition: background .15s ease-out;
 
         &:hover,