Fix T1924: Deleting a Google event that no longer exists on the remote should not fail.
Fix T1924: Deleting a Google event that no longer exists on the remote should not fail.

Summary: Causes spurious alerts.

Test Plan:
Manually tested that inbox.events.actions.gmail.remote_delete_event() does not err out
on attempting to delete an event again.

Reviewers: emfree

Reviewed By: emfree

Differential Revision: https://phab.nylas.com/D1614

gale320/sync-engine,wakermahmud/sync-engine,nylas/sync-engine,Eagles2F/sync-engine,nylas/sync-engine,ErinCall/sync-engine,gale320/sync-engine,nylas/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,jobscore/sync-engine,wakermahmud/sync-engine,Eagles2F/sync-engine,gale320/sync-engine,closeio/nylas,jobscore/sync-engine,jobscore/sync-engine,Eagles2F/sync-engine,Eagles2F/sync-engine,wakermahmud/sync-engine,wakermahmud/sync-engine,wakermahmud/sync-engine,nylas/sync-engine,closeio/nylas,ErinCall/sync-engine,ErinCall/sync-engine,gale320/sync-engine,gale320/sync-engine,closeio/nylas,jobscore/sync-engine,closeio/nylas,ErinCall/sync-engine