Don't specify wakeup sensor value for hinge angle test

getDefaultSensor already verifies that the hinge angle sensor must be a
wakeup sensor. This also ensures that the framework code is implemented
correctly to return a non-null value if the sensor exists.

Bug: 157581504
Test: Run test on emulator and verify that it passes.
Change-Id: Ie273c035205fa95d896fa4aa17152e3cf05f66fa
1 file changed