Use combined_first_and_last_name_in_address? preference for solidus 3.0

[DanielePalombo]

On Solidus Support 3.0 PR I have switched the method to use based on solidus version, it would be nice to use this https://github.com/solidusio/solidus_support/blob/master/lib/solidus_support.rb#L24

[stale]

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