[test] Adjust KVOKeyPaths test for back deployment
[test] Adjust KVOKeyPaths test for back deployment

C.f. https://github.com/apple/swift/pull/40051

rdar://85274909

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