CLI: Fix mintSignal command

[fordN]

trafficstars

Mint signal command required an update to work with NFT subgraphs.

[codecov[bot]]

Codecov Report

Merging #632 (ee8b1f0) into dev (c76879d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #632   +/-   ##
=======================================
  Coverage   90.29%   90.29%           
=======================================
  Files          35       35           
  Lines        1752     1752           
  Branches      293      293           
=======================================
  Hits         1582     1582           
  Misses        170      170           

Flag	Coverage Δ
unittests	90.29% <ø> (ø)

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