Fix a bug to handle the touch ACTION_DOWN properly when inline suggestion view is obscured

* if the user taps quickly such that there is only ACTION_DOWN and
  ACTION_UP, without ACTION_MOVE, it'd be possible that the
  isSecure check is not  respected. This patch fixes that case.

Test: atest android.autofillservice.cts.inline
Bug: 157772682
Bug: 158038231

Change-Id: Icd21bf2f88259673bb9b20e46e63672648495eac