Sorting fix for 10+ groups in tidy_ard_column_order()

[ddsjoberg]

What changes are proposed in this pull request?

• The tidy_ard_column_order() now correctly orders grouping columns when there are 10+ groups. This also corrects an issue in the hierarchical functions where the ordering of the variables matters. ([Bug]: ard_hierarchical() grouping columns are incorrect when 10+ variables are present #352)

Reference GitHub issue associated with pull request. e.g., 'closes #'
closes #352

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[edelarua]

Lgtm!! Thanks @ddsjoberg