fix(examples): restored expected behavior for Ownable

[n2p5]

Ownable had a regression in expected behavior when some calls were changed from std.PreviousRealm() -> std.CurrentRealm()

This PR fixes the expected behavior of Ownable so that it uses std.PreviousRealm() as it did before by fixing the tests so that they run within a CodeRealm context.

This also fixes the failing tests for gno.land/r/n2p5/mgroup that were introduced after the recent change to Ownable.

[Gno2D2]

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[leohhhn]

Can you please completely revert the changes? Ie the names of the functions as well? 🙏

[gfanton]

After discussing with @jaekwon, it seems that we want to keep OwnedByPrevious if using PreviousRealm.

Updated in #4211.

[gfanton]

Merging in #4211