MM-10760: Using master for any Exec call (#8895)

store/sqlstore/system_store.go

@@ -89,7 +89,7 @@ func (s SqlSystemStore) GetByName(name string) store.StoreChannel {
 func (s SqlSystemStore) PermanentDeleteByName(name string) store.StoreChannel {
 	return store.Do(func(result *store.StoreResult) {
 		var system model.System
-		if _, err := s.GetReplica().Exec("DELETE FROM Systems WHERE Name = :Name", map[string]interface{}{"Name": name}); err != nil {
+		if _, err := s.GetMaster().Exec("DELETE FROM Systems WHERE Name = :Name", map[string]interface{}{"Name": name}); err != nil {
 			result.Err = model.NewAppError("SqlSystemStore.PermanentDeleteByName", "store.sql_system.permanent_delete_by_name.app_error", nil, "", http.StatusInternalServerError)
 		}