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Fix unpinning on device with Navigation Bar
The introduction of the long press back to kill option messed with the stock behavior of the long press back button to unpin the locked app. Fortunately, all the job was already done for the no navigation bar case, so all I did was to extend the same logic to the case where nav bar is present. Change-Id: I2921c653c6e9ce51d49bda31f6e9b64654aeaeaa