[0.16.0.1] Copycat duplicate mode highlight doesn't reset when changing copycat targets

When you set an item as the copycat target while the copycat is currently in duplicate mode with another item, the orange highlight around “R| Duplicate Mode” remains despite the copycat not being in duplicate mode.

Steps to Reproduce

Put the copycat in duplicate mode and set another item as the copycat target.

What I expected to happen

The orange highlight around the “R| Duplicate Mode” dialog disappears, as the copycat is no longer in duplicate mode.

What happened

The orange highlight remains despite the copycat not being in duplicate mode.