wifi: mac80211: cancel color change finalize work when link is stopped

The color change finalize work might be called after the link is
stopped, which might lead to a kernel crash.

Signed-off-by: Michael-CY Lee <michael-cy.lee@mediatek.com>
Link: https://patch.msgid.link/20240705074326.11172-1-michael-cy.lee@mediatek.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>