Register handler with individual event for combined flags

[hrkn]

This PR fixes events from combined flags (i.e. Event::move and Event::close) are handled as unexpected event by misregistrating event handler function.

Steps to reproduce issue

1. Build example (no modification needed)
2. Run example with arbitrary directory (ex. /tmp)
3. Run touch /tmp/a
4. Run mv /tmp/a /tmp/aa
5. Now you may see message like below which says events are not expected

   Event moved_from  on "/tmp/a" at 4072388246712760 was triggered, but was not expected
   Event moved_to  on "/tmp/aa" at 4072388246784505 was triggered, but was not expected