Immediately debounce when timeout is 0 for an existing handle.

Bug: 64955044
Change-Id: I3b562f40087808a306a60feec37cba65b1ca2044
Test: Verified with this change that we are able to get NFC events after
calling an NfcAdapter#ignore with a debounce of 0 msec after
initially calling NfcAdapter#ignore with a debounce of 3600000 on
Daydream viewer v1.
1 file changed