fix(import): correct count displayed juste before import data to destination

[jacquesfize]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.99%. Comparing base (0aa4bcf) to head (443a16e).
Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
backend/geonature/core/imports/routes/imports.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3336   +/-   ##
========================================
  Coverage    83.99%   83.99%           
========================================
  Files          122      122           
  Lines         9719     9728    +9     
========================================
+ Hits          8163     8171    +8     
- Misses        1556     1557    +1     

Flag	Coverage Δ
pytest	83.99% <92.85%> (+<0.01%)	⬆️

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