Stepper: remove redundant SCSS variable from the ThemeBuilder publication (DevExpress#29945)

Author: EugeniyKiyashko

packages/devextreme-scss/scss/widgets/fluent/stepper/_colors.scss

@@ -148,11 +148,6 @@ $stepper-step-invalid-selected-bg: $stepper-step-danger-bg !default;
 * $type color
 */
 $stepper-step-invalid-selected-hover-bg: $stepper-step-danger-hover-bg !default;
-
-/**
-* $name 250. Shadow color
-* $type color
-*/
 $stepper-step-disabled-shadow: $base-bg !default;
 
 /**

packages/devextreme-scss/scss/widgets/generic/stepper/_colors.scss

@@ -58,11 +58,6 @@ $stepper-step-base-text-color: $base-text-color !default;
 * $type color
 */
 $stepper-step-base-label-color: $base-text-color !default;
-
-/**
-* $name 250. Shadow color
-* $type color
-*/
 $stepper-step-disabled-shadow: $base-bg !default;
 
 /**

packages/devextreme-scss/scss/widgets/material/stepper/_colors.scss

@@ -58,11 +58,6 @@ $stepper-step-base-text-color: $base-inverted-text-color !default;
 * $type color
 */
 $stepper-step-base-label-color: $base-label-color !default;
-
-/**
-* $name 250. Shadow color
-* $type color
-*/
 $stepper-step-disabled-shadow: $base-bg !default;
 
 /**