Argument `$color` of `red($color)` must be a color

[zdrawku]

Description

Argument $color of red($color) must be a color is returned after upgrading to igniteui-angular 7

Steps:

1. Open the Sample
2. Observe the error

Note: The sample is from grid editing topic of our webpage

[zdrawku]

This issue is caused by the first-class functions again (get-function). Adding a reference to the issue in StackBlitz logged from us.