[JENKINS-65021] Disabled dropdown items no longer look disabled
[JENKINS-65021] Disabled dropdown items no longer look disabled

(cherry picked from commit 8820ee1ff0d88b046a7ab59883de88f6c1197ecd)

DanielWeber/jenkins,DanielWeber/jenkins,DanielWeber/jenkins,DanielWeber/jenkins,DanielWeber/jenkins,DanielWeber/jenkins,DanielWeber/jenkins