Fix incorrect reference to type
Fix incorrect reference to type

Fixing the PHP notice for undefined property:

```
Notice Error: Undefined property: CsvMigrations\FieldHandlers\CsvField::$getType
in [src/FieldHandlers/FieldHandlerFactory.php, line 140]
```

QoboLtd/cakephp-csv-migrations,QoboLtd/cakephp-csv-migrations