fix(grid): Make sure border does not appear when new theme is loaded runtime.#17032

MayaKirova wants to merge 5 commits into20.1.xIgniteUI/igniteui-angular:20.1.xfrom

mkirova/fix-3903-20.1.xIgniteUI/igniteui-angular:mkirova/fix-3903-20.1.xCopy head branch name to clipboard