Merge pull request #2958 from lukegaluszka/2949_variable_scss

fix(scss): tabs striped variable update

Author: adamdbradley

scss/_variables.scss

@@ -281,8 +281,8 @@ $tab-item-max-width:              150px !default;
 
 $tabs-off-opacity:                0.4 !default;
 $tabs-striped-off-opacity:        $tabs-off-opacity !default;
-$tabs-striped-off-color: #000;
-$tabs-striped-border-width: 2px;
+$tabs-striped-off-color:          #000 !default;
+$tabs-striped-border-width:       2px !default;
 
 
 // Items