Cancel print job if PrintActivity was finished before spooler could be

connected.

This can happen if finish() was called immediately after onResume() and
before PrintSpoolerProvider.onServiceConnected.

There is actually a small issue left. If the connection to the spooler
gets destroyed before it was ever connected the print job does not get
canceled. In this case it will stay "created" until the next reboot and
then it will not get recreated.

Bug: 26428518
Change-Id: I1b8696f326b842160e4db77b985577a1c8978def