guilds_tree: do not forward key events

cmd/guilds_tree.go

@@ -235,5 +235,5 @@ func (gt *GuildsTree) onInputCapture(event *tcell.EventKey) *tcell.EventKey {
 		return tcell.NewEventKey(tcell.KeyEnter, 0, tcell.ModNone)
 	}
 
-	return event
+	return nil
 }