Do not use legacy_ertscript_workflow in CsvExport2

[berland]

This:

semeio/src/semeio/workflows/csv_export2/csv_export2.py

Lines 144 to 150 in 050a9ce

	@plugin(name="semeio")
	def legacy_ertscript_workflow(config):
	workflow = config.add_workflow(CsvExport2Job, "CSV_EXPORT2")
	workflow.parser = csv_export_parser
	workflow.description = DESCRIPTION
	workflow.examples = EXAMPLES
	workflow.category = "export"

triggers a warning in Ert:

  /data/projects/ert/src/ert/plugins/__init__.py:37: DeprecationWarning: Use of legacy_ertscript_workflow is deprecated. Please see documentation for how to use ertscript_workflow instead
    res = func(*args, **kwargs)