phonewm: give longer wait for open all-app test am: dc5272ef

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23249305



Change-Id: If37e2db6e9e631176bfbf88cae4d08e13caa9234
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>