Update validation loss on TAE

[clarktemple03]

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Update to TAE so that validation loss is reading from validation_dataloader

[codecov[bot]]

Codecov Report

Merging #205 (f273aef) into main (dd91e12) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
- Coverage   93.74%   93.72%   -0.02%     
==========================================
  Files         136      136              
  Lines       10765    10765              
==========================================
- Hits        10092    10090       -2     
- Misses        673      675       +2     

Impacted Files	Coverage Δ
deeptime/decomposition/deep/_tae.py	99.05% <100.00%> (ø)
deeptime/markov/msm/tram/_tram_dataset.py	96.44% <0.00%> (-1.02%)	:arrow_down:

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[clonker]

Thanks!