Review commented out global styles in icons.js

[wise-king-sullyman]

In the above referenced file there are several references to removed global style values which are currently commented out.

These style should be reviewed and removed if they're no longer needed, or updated to use a token if they are needed.

[nicolethoen]

Do this as a follow up to https://github.com/patternfly/patternfly-org/pull/4102