Avoid using redundant values in scss files.

[SebConejo]

We found several uses of redundant values in scss files.

In packages\core\admin\src\app\modules\layout\touch-menu\touch-menu.component.scss:96

• border-color: transparent transparent rgba($sidenav-item-color, 0.1) transparent;

In packages\core\admin\src\app\modules\layout\touch-menu\touch-menu.component.scss:84

• border-color: transparent transparent rgba($sidenav-item-color, 0.1) transparent;

In packages\core\admin\src\app\modules\layout\side-menu\side-menu.component.scss:39

• margin: 5px 0 0 0; we could write : margin: 5px 0 0;

In packages\core\admin\src\styles\components_colorpicker.scss:68

• border-color: transparent transparent $grey-lighter transparent;. We could write : border-color: transparent transparent $grey-lighter;

In packages\core\admin\src\styles\components_colorpicker.scss:63

• border-color: transparent transparent $light transparent;