Refactor: Remove obsolete function

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

@@ -296,16 +296,5 @@ public class EmbeddedDatabaseHandler {
         return count;
     }
 
-    private List<CityObject> retrieveCityObjects(ResultSet rs) throws SQLException {
-        List<CityObject> cos = new ArrayList<>();
-        while (rs.next()) {
-            try (InputStream is = rs.getBinaryStream("data")) {
-                cos.add(SerializationUtils.deserialize(is));
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
-        }
-        return cos;
-    }
 
 }