[Angular Elements] Paginator specific css vars do not work.

[MayaKirova]

Description

When setting paginator's css vars for wc grid, they do not take affect.

• igniteui-angular version:
• browser:

Steps to reproduce

1. Run a grid sample with paginator.
2. Set some css vars scoped to the paginator:

    --igx-paginator-background-color: #231c2c;
    --igx-paginator-text-color: #d0ab23;
    --igx-paginator-border-color:#d0ab23;

They should change the colors.

Result

They have no affect.

Expected result

They should change the paginator colors.