fix(x/group): rename group's legacy ORM error codespace to prevent co…

[technicallyty]

…llisions with new ORM codespace

Description

Closes: N/A

• Renames x/group's legacy ORM error codespace, as it collides with the new ORM's error codespace. Using both new ORM and x/group would cause a duplicate registration of "orm", causing the app to panic.

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[julienrbrt]

thanks!