Fix metrics

[jdb78]

Description

Checklist

• Amended changelog for large changes (and added myself there as contributor)
• Used pre-commit hooks when committing to ensure that code is compliant with hooks. Install hooks with pre-commit install.
  To run hooks independent of commit, execute pre-commit run --all-files

Make sure to have fun coding!

[codecov-commenter]

Codecov Report

Merging #491 (a988608) into master (e821832) will decrease coverage by 0.10%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #491      +/-   ##
==========================================
- Coverage   89.21%   89.10%   -0.11%     
==========================================
  Files          24       24              
  Lines        3682     3682              
==========================================
- Hits         3285     3281       -4     
- Misses        397      401       +4     

Flag	Coverage Δ
cpu	89.10% <50.00%> (-0.11%)	⬇️
pytest	89.10% <50.00%> (-0.11%)	⬇️

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Impacted Files	Coverage Δ
pytorch_forecasting/metrics.py	93.45% <50.00%> (ø)
pytorch_forecasting/models/nn/rnn.py	87.34% <0.00%> (-5.07%)	⬇️

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