datasource graph node colors should override the active/primary color chosen

[arawinters]

Describe the bug
when selecting datasource colors if the primary node color is chosen and the primary node is part of that datasource the color displayed is the color chosen for the primary and not the datasource member color.

Additionally there is no way to "unset" a color once chosen which will be a necessary function if the behavior is changed to allow the datasource colors to override the primary.