fix(integration): Material Social Card URI was wrong for Material blog posts

[Guts]

Bug introduced in #354

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.98%. Comparing base (d446712) to head (18c2c34).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #418      +/-   ##
==========================================
+ Coverage   83.94%   83.98%   +0.04%     
==========================================
  Files          11       11              
  Lines         766      768       +2     
  Branches      127      128       +1     
==========================================
+ Hits          643      645       +2     
  Misses         81       81              
  Partials       42       42              

Flag	Coverage Δ
unittests	83.98% <100.00%> (+0.04%)	⬆️

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Files with missing lines	Coverage Δ
...lugin/integrations/theme_material_social_plugin.py	88.79% <100.00%> (+0.19%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud