Slider Tooltip Callout Position bug

[TeyaVes]

Describe the bug
When calculating the position of the slider tooltip callout position, we are using the following styles:

 // Slider tooltip
    .k-slider-tooltip {
        .k-callout-n,
        .k-callout-s {
            margin-inline-start: - list.slash( $kendo-tooltip-callout-size, 2 );
        }

        .k-callout-w,
        .k-callout-e {
            margin-top: - list.slash( $kendo-tooltip-callout-size, 2 );
        }
    }

However, when compiled, the mentioned styles produce invalid CSS:

.k-slider-tooltip .k-callout-n, .k-slider-tooltip .k-callout-s {
    margin-inline-start: -6px / 2;
}

On the other hand, it seems that the callout is positioned correctly despite the invalid CSS, meaning that we need to check if the styles are needed at all.