Do not combine multiple import updates if there is only one importer

[thomaskrause]

No description provided.

[codecov]

Codecov Report

Attention: 46 lines in your changes are missing coverage. Please review.

Comparison is base (615cfd1) 80.27% compared to head (930cafb) 80.60%.

Files	Patch %	Lines
src/manipulator/merge.rs	50.00%	20 Missing and 3 partials ⚠️
src/manipulator/collapse.rs	36.36%	5 Missing and 2 partials ⚠️
src/manipulator/link.rs	14.28%	6 Missing ⚠️
src/importer/conllu/mod.rs	44.44%	5 Missing ⚠️
src/workflow.rs	85.71%	0 Missing and 3 partials ⚠️
src/bin/annatto.rs	71.42%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
+ Coverage   80.27%   80.60%   +0.32%     
==========================================
  Files          30       30              
  Lines       10149    10110      -39     
  Branches    10149    10110      -39     
==========================================
+ Hits         8147     8149       +2     
+ Misses        839      806      -33     
+ Partials     1163     1155       -8     

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