Revert "Add members from GuildMembersChunk to state (#454)" (#455)

This reverts commit e4487b30d4d846b1fdc08fd3982bd5b9965a8cc9.

state.go

@@ -816,13 +816,6 @@ func (s *State) OnInterface(se *Session, i interface{}) (err error) {
 		if s.TrackMembers {
 			err = s.MemberRemove(t.Member)
 		}
-	case *GuildMembersChunk:
-		if s.TrackMembers {
-			for i := range t.Members {
-				t.Members[i].GuildID = t.GuildID
-				err = s.MemberAdd(t.Members[i])
-			}
-		}
 	case *GuildRoleCreate:
 		if s.TrackRoles {
 			err = s.RoleAdd(t.GuildID, t.Role)