[ColorIcons] Color icons not showing for consts with func scope

[willlarche]

In themes.dart from flutter gallery

See image. The consts primaryColor and secondaryColor are not showing a color icon on the left.

Nice to have: since they are consts, it would be great it it showed the same icon where they are consumed like line 34-35.

[jwren]

Assigned to Devon to triage, I don't know who did this initial work.

[devoncarew]

This was me; on deck seems right.

[devoncarew]

Thanks for the report! This was addressed for the Nov. release.