The Classic-Opal swatch has low contrast for the Pager numbers

[gdenchevprog]

Description

The Classic Opal swatch has a low contrast for the Pager numbers making them hard to read.

Demo

The problem can be observed in one of the demos with a Pager:

https://demos.telerik.com/kendo-ui/pager/index?autoRun=true&theme=classic-opal
https://demos.telerik.com/kendo-ui/grid/pager-functionality?autoRun=true&theme=classic-opal

Screenshot

[aleksandarevangelatov]

Also reported in ticket 1590059