Migrate Team.RemoveAllMembersByTeam to Sync by default

commit 5cc7051ca2c5f0f665eda79b22a46b8ad0c17398
Author: phillipahereza <pahereza@gmail..com>
Date:   Sat Jul 6 15:01:18 2019 +0300

store/sqlstore/team_store.go

@@ -772,13 +772,12 @@ func (s SqlTeamStore) RemoveMember(teamId string, userId string) *model.AppError
 	return nil
 }
 
-func (s SqlTeamStore) RemoveAllMembersByTeam(teamId string) store.StoreChannel {
-	return store.Do(func(result *store.StoreResult) {
-		_, err := s.GetMaster().Exec("DELETE FROM TeamMembers WHERE TeamId = :TeamId", map[string]interface{}{"TeamId": teamId})
-		if err != nil {
-			result.Err = model.NewAppError("SqlTeamStore.RemoveMember", "store.sql_team.remove_member.app_error", nil, "team_id="+teamId+", "+err.Error(), http.StatusInternalServerError)
-		}
-	})
+func (s SqlTeamStore) RemoveAllMembersByTeam(teamId string) *model.AppError {
+	_, err := s.GetMaster().Exec("DELETE FROM TeamMembers WHERE TeamId = :TeamId", map[string]interface{}{"TeamId": teamId})
+	if err != nil {
+		return model.NewAppError("SqlTeamStore.RemoveMember", "store.sql_team.remove_member.app_error", nil, "team_id="+teamId+", "+err.Error(), http.StatusInternalServerError)
+	}
+	return nil
 }
 
 func (s SqlTeamStore) RemoveAllMembersByUser(userId string) *model.AppError {