Improve InputTransport test coverage

When sequence number is zero, then publicMotionEvent should return
BAD_VALUE. That check happens before the pointerCount check.
Therefore, this test does not currently fail due to a single
bad value of pointerCount, because it is also supplying an
invalid value for sequenceNumber. Use a valid sequenceNumber
value in this test, and add a separate test for bad value
of pointerCount.

Test: m -j libinput_tests_InputPublisherAndConsumer_test && adb push
out/target/product/$TARGET_PRODUCT/data/nativetest64/libinput_tests
/data/nativetest64
then run the binary on the target and check the output

Change-Id: I0d041870da81a1e7b95a1f83f822a0df15ee3a27