remove event bus from evidence reactor (#6320)

evidence/reactor.go

@@ -55,7 +55,6 @@ type Reactor struct {
 	service.BaseService
 
 	evpool      *Pool
-	eventBus    *types.EventBus
 	evidenceCh  *p2p.Channel
 	peerUpdates *p2p.PeerUpdates
 	closeCh     chan struct{}
@@ -87,11 +86,6 @@ func NewReactor(
 	return r
 }
 
-// SetEventBus implements events.Eventable.
-func (r *Reactor) SetEventBus(b *types.EventBus) {
-	r.eventBus = b
-}
-
 // OnStart starts separate go routines for each p2p Channel and listens for
 // envelopes on each. In addition, it also listens for peer updates and handles
 // messages on that p2p channel accordingly. The caller must be sure to execute