Fix bit manipulation in `ActiveTaskStatus::withEscalatedPriority()`.
Fix bit manipulation in `ActiveTaskStatus::withEscalatedPriority()`.

Due to a missing `~` when trying to mask in a new priority + the
`IsEscalated` flag, we were instead getting an incorrect priority as
well as dropping other useful bits. This led to assertions about the
running state of a task not being set.

benlangmuir/swift,xwu/swift,glessard/swift,roambotics/swift,JGiola/swift,xwu/swift,benlangmuir/swift,ahoppen/swift,apple/swift,benlangmuir/swift,atrick/swift,benlangmuir/swift,atrick/swift,JGiola/swift,roambotics/swift,gregomni/swift,apple/swift,rudkx/swift,atrick/swift,roambotics/swift,xwu/swift,rudkx/swift,atrick/swift,JGiola/swift,roambotics/swift,hooman/swift,roambotics/swift,rudkx/swift,xwu/swift,glessard/swift,JGiola/swift,ahoppen/swift,JGiola/swift,benlangmuir/swift,atrick/swift,glessard/swift,xwu/swift,hooman/swift,xwu/swift,hooman/swift,xwu/swift,gregomni/swift,ahoppen/swift,rudkx/swift,rudkx/swift,glessard/swift,gregomni/swift,ahoppen/swift,hooman/swift,roambotics/swift,gregomni/swift,gregomni/swift,ahoppen/swift,apple/swift,rudkx/swift,apple/swift,benlangmuir/swift,ahoppen/swift,glessard/swift,hooman/swift,apple/swift,hooman/swift,JGiola/swift,glessard/swift,apple/swift,gregomni/swift,atrick/swift,hooman/swift