Update unit test of removeSupportAllNFTs method of NFT module

[Incede]

Description

• The test for removeSupportAllNFTs should work by 1) creating a random chainID, 2) saving that chainID to the supportedNFTsStore store, 3) removing the support for that chainID, and 4) checking that the supportedNFTsStore no longer contains the chainID key.
• But in step 2, it incorrectly saves a random wrong value to the supportedNFTsStore store instead of using the chainID variable
• By removing the call to supportedNFTsStore.save, the test still passes which is undesirable.

Acceptance Criteria

• Replace the call to supportedNFTsStore.save’s utils.getRandomBytes(LENGTH_CHAIN_ID) argument with the chainID variable.
• Add a check in the test that ensures that the NFT is supported before removing it.

Please describe the conditions which must be met for this issue to close

Additional Information

release/6.1.0