Fix VirtualTouchScreenTest by removing wait for the hover event after we added the Slot axis setup.

We used to have a problem when Slot axis is not properly set up so
intermediate input events sent from virtual touch screen have 0
pressure. This is fixed by ag/19908041 so we can remove the assertion
for hover events in the test now.

Cherry-picked-from: https://android-review.googlesource.com/c/platform/cts/+/2232769

Bug: b/216638606
Bug: b/246450805
Bug: b/244744917
Bug: b/246478665

Test: CtsHardwareTestCases:android.hardware.input.cts.tests.VirtualTouchscreenTest#sendTouchEvent

Change-Id: Ia6666082efd03a3da4217c01df3cfc041fa64c50