[4.1] Always write the importer version to .import files #84062
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Godot 4.0 and 4.1 already have an importer version system, but the number is just... not written if it's 0. I think we should always write the importer version, so future importers can unambiguously know the importer version.
This was driven by a desire to make the version more explicit for #84034, but this is not required for #84034 to work.