Do not unnecessarily increase community numbers in assign_communities

[maltekuehl]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.51%. Comparing base (b7907e5) to head (a3830b0).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
spatiomic/segment/_assign_communities.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   77.56%   77.51%   -0.05%     
==========================================
  Files          54       54              
  Lines        1894     1895       +1     
==========================================
  Hits         1469     1469              
- Misses        425      426       +1     

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