Fixes paths with spaces in seq2seq example

[KylePiira]

Fixes #6477

[codecov]

Codecov Report

Merging #6493 into master will increase coverage by 0.21%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #6493      +/-   ##
==========================================
+ Coverage   80.38%   80.59%   +0.21%     
==========================================
  Files         156      156              
  Lines       28058    28058              
==========================================
+ Hits        22554    22613      +59     
+ Misses       5504     5445      -59     

Impacted Files	Coverage Δ
src/transformers/trainer.py	37.84% <0.00%> (ø)
src/transformers/modeling_tf_flaubert.py	24.53% <0.00%> (-63.81%)	⬇️
src/transformers/pipelines.py	79.69% <0.00%> (-0.26%)	⬇️
src/transformers/modeling_bert.py	88.42% <0.00%> (+0.16%)	⬆️
src/transformers/generation_tf_utils.py	86.71% <0.00%> (+0.25%)	⬆️
src/transformers/modeling_tf_bert.py	98.38% <0.00%> (+29.31%)	⬆️

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[sshleifer]

Thanks!