Fix warning raster format mismatch ome-zarr

[LucaMarconato]

Closes #1004

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.08%. Comparing base (2445eb7) to head (3ef9098).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/spatialdata/_io/io_zarr.py	75.00%	2 Missing ⚠️
src/spatialdata/_io/format.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1005      +/-   ##
==========================================
- Coverage   92.11%   92.08%   -0.03%     
==========================================
  Files          48       48              
  Lines        7442     7446       +4     
==========================================
+ Hits         6855     6857       +2     
- Misses        587      589       +2     

Files with missing lines	Coverage Δ
src/spatialdata/_io/format.py	84.00% <50.00%> (+0.07%)	⬆️
src/spatialdata/_io/io_zarr.py	93.06% <75.00%> (-1.83%)	⬇️

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