Wrong color in ui.Warn when terminal.CommandColor is used

[clhgithubfree]

The output colors created by this command are incorrect:

ui.Warn("Try using the the '%s' command.", terminal.CommandColor("ibmcloud login"))

The text before the substituted parameter is purple as expected.
The substitute text is yellow as expected.
But the text after that is white instead of purple.

Not a critical error, but want to report it.