Auth V1 to V2 migration bugfix

[yoongbok-lee]

Summary of the Bug

This bug is in x/auth where the migration from v1 to v2 is ignored due to the variable mismatch. Since the upgrade is already past and the legacy upgrade handlers will be removed soon, we can fix the migration logic so it can correctly migrate the auth state.

Steps to Reproduce

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4. See error

Expected behavior

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