fix-20: save N tokens from the same nft contract addr

[fforbeck]

Proposed Changes

• It should be possible to save/accept different token ids from the same nft contract address.

[codecov]

Codecov Report

Merging #514 (3a188de) into master (ee146fa) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 3a188de differs from pull request most recent head 16a779a. Consider uploading reports for the commit 16a779a to get more accurate results

@@           Coverage Diff           @@
##           master     #514   +/-   ##
=======================================
  Coverage   82.30%   82.31%           
=======================================
  Files          53       53           
  Lines        1854     1855    +1     
  Branches      431      431           
=======================================
+ Hits         1526     1527    +1     
  Misses        328      328           

Impacted Files	Coverage Δ
contracts/extensions/nft/NFT.sol	83.33% <100.00%> (+0.31%)	⬆️

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