fix(#1264): discard first space after a token

[frascuchon]

In this PR we discard from token candidates the first space after a token.

Closes #1264

[codecov]

Codecov Report

Merging #1591 (e367fbd) into master (ec6104d) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1591      +/-   ##
==========================================
- Coverage   95.37%   95.33%   -0.05%     
==========================================
  Files         135      135              
  Lines        6426     6430       +4     
==========================================
+ Hits         6129     6130       +1     
- Misses        297      300       +3     

Flag	Coverage Δ
pytest	95.33% <100.00%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
...brix/server/apis/v0/models/token_classification.py	98.24% <100.00%> (+0.04%)	⬆️
...ubrix/labeling/text_classification/label_errors.py	86.74% <0.00%> (-3.62%)	⬇️

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