Revert "Reduce touch exploration sensitivity."

This reverts commit 9d250972.

Reason for revert: This was found to cause problems when enabled. Users could skip over items while touch-exploring touch slop size.

Test: atest CtsAccessibilityServiceTestCases:TouchExplorerTest FrameworksServicesTests:TouchExplorerTest
Change-Id: Ia4a0e99866212c10918279691b04df93ce36e751