fix(grid): Make sure border does not appear when new theme is loaded runtime.#17030

MayaKirova wants to merge 4 commits into21.1.xIgniteUI/igniteui-angular:21.1.xfrom

mkirova/fix-3903-21.1.xIgniteUI/igniteui-angular:mkirova/fix-3903-21.1.xCopy head branch name to clipboard