Make sure the correct input consumer is created

Let `isGestureBlockedTask` return false directly if
`mGestureBlockingTaskId` is not valid. This can avoid
the caller go to create incorrect InputConsumer when
the chekcing `taskId` is also invalid.

Bug: 402218420
Flag: EXEMPT bug fix
Test: m
Change-Id: Ia0cde8ee2b97fc92028458d01487d958f2e87a80