molmedb annotator indexing fix

[DominikMartinat]

Fixed issue with indexing of rows to drop from SPARQL query resulsts.
Changed example from molmedb annotator output to show right row.

DisGeNet annotator in the example does not work now. Maybe an issue with API key?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 12.17%. Comparing base (a2c406e) to head (3d166b3).
Report is 6 commits behind head on main.

Files	Patch %	Lines
src/pyBiodatafuse/annotators/molmedb.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   12.36%   12.17%   -0.19%     
==========================================
  Files          25       25              
  Lines        1189     1191       +2     
  Branches      222      223       +1     
==========================================
- Hits          147      145       -2     
- Misses       1040     1042       +2     
- Partials        2        4       +2     

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