Fix wizard for datasource creation when a template is selected

The datasource wizard to add a datasource considers the datasource class names used in the datasource templates even if the user added the jdbc-driver with a different datasource class name, in this case, the user set datasource should be used instead of the templates.

As a workaround the user should:
1) add the jdbc driver as a module and add them in in jdbc-driver and set the datasource class name and xa datasource class name.
2) Use the wizard to add the datasource and select the Custom template, in the JDBC Driver step, selects the jdbc-driver