Fix: Turn autocommit back on after batched commit

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/database/DatabaseHandler.java

@@ -154,6 +154,8 @@ public class DatabaseHandler {
                 logger.error(Localization.getText("DatabaseHandler.batchCommitFailure"), id);
                 logger.error(e.getMessage());
                 return false;
+            } finally{
+                con.setAutoCommit(true);
             }
         } catch (SQLException e){
             logger.error(Localization.getText("DatabaseHandler.connectionFailure"));