[1221] Fix scaling calculation in MASE - unpack encoder_target sequence

[MBelniak]

Description

This PR ...

Checklist

• Linked issues (if existing)
• Amended changelog for large changes (and added myself there as contributor)
• Added/modified tests
• 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!

[MBelniak]

Fixes #1221

[jdb78]

good catch!

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.08% 🎉

Comparison is base (b4ce1cf) 90.11% compared to head (01f1ca1) 90.19%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1230      +/-   ##
==========================================
+ Coverage   90.11%   90.19%   +0.08%     
==========================================
  Files          30       30              
  Lines        4714     4714              
==========================================
+ Hits         4248     4252       +4     
+ Misses        466      462       -4     

Flag	Coverage Δ
cpu	90.19% <100.00%> (+0.08%)	⬆️
pytest	90.19% <100.00%> (+0.08%)	⬆️

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Files Changed	Coverage Δ
pytorch_forecasting/metrics/point.py	91.91% <100.00%> (ø)

... and 1 file with indirect coverage changes

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