fix/TFTModel_flask

[dennisbader]

• resolves flask8 issues with unused variables

[codecov-commenter]

Codecov Report

Merging #745 (0f7a516) into master (334b0d8) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #745      +/-   ##
==========================================
- Coverage   90.80%   90.79%   -0.01%     
==========================================
  Files          67       67              
  Lines        6741     6739       -2     
==========================================
- Hits         6121     6119       -2     
  Misses        620      620              

Impacted Files	Coverage Δ
darts/models/forecasting/tft_model.py	95.65% <100.00%> (-0.02%)	⬇️
darts/utils/likelihood_models.py	96.04% <0.00%> (-0.01%)	⬇️

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