eis: sync event codes with libei
Commit da37da13 "ei: change the API to match the protocol interfaces closer" change the event type numbers for per-capability grouping but the follow-up commit e6954b76 for eis didn't do the same. Right now the event types are out sync.
This doesn't technically matter as this is a libeis implementation detail (those types don't exist on the protocol) but it'd still be nice to sync them before we ship 1.0.
This is an ABI break but not an API break.