Unshielding NFT transfer via IBC failed

[yito88]

I found two bugs for NFT unshielding transfer via IBC:

• IBC VP tried to check the unshielding NFT transfer as a transfer from the transparent account and always rejected it
  • The bug was caused in Support only a transparent address as a refund target #3646
• Unshiedling transfer failed when NFT metadata (class uri, class data, token uri or token data) was set
  • The failure in the exising IBC NFT test with Stargaze didn't happen because these metadata were not set (i.e. all of them are null). It happened in the new test on which I'm working now because the contract set the metadata (class data).