Fix service touch exploration.

We were queueing up ACTION_HOVER_EXIT when initiating touch exploration which doesn't make sense. ACTION_HOVER_EXIT only makes sense on ACTION_UP when touch exploring.

Fix: 219814318
Fix: 220387502
Test: Verify that entering a pin works as expected.
Test: Verify that touch exploration does not get stuck often, only occasionally per b/215654623
Change-Id: Iab29f7736ab4ff3ea24c26109073481a876ffb58