Fix SysUI when an app started from the affordances crashes

- Fix infinite recursion in this case.
- If the app crashes, we are waiting for either setOccluded or
  hideKeyguard to be called. However, neither of these gets called
  in this case, so we recover from it by adding a timeout of 5
  seconds.

Bug: 18652789
Change-Id: Ib9a043f5692a8578703df1db08e1a6b9dcfbc742