Tabs: not change tab color on hover when disabled (#10549)

For tabs of style "border-card", don't set the color property on hover
if it is disabled.

packages/theme-chalk/src/tabs.scss

@@ -224,7 +224,7 @@
         border-right-color: $--border-color-base;
         border-left-color: $--border-color-base;
       }
-      &:hover {
+      &:not(.is-disabled):hover {
         color: $--color-primary;
       }
     }