Fix Skosmos 2 twig syntax error on search result page

[osma]

Reasons for creating this PR

Search result pages are currently broken in Skosmos 2, after the SEO-related changes, due to a Twig template syntax bug. This PR will remove the extra endblock tag, making the search result page render properly again.

Link to relevant issue(s), if any

• fix for changes made in SEO functionality backport for skosmos 2 #1666

Description of the changes in this PR

Drop extra endblock tag.

Known problems or uncertainties in this PR

None

Checklist

• phpUnit tests pass locally with my changes
• I have added tests that show that the new code works, or tests are not relevant for this PR (e.g. only HTML/CSS changes)
• The PR doesn't reduce accessibility of the front-end code (e.g. tab focus, scaling to different resolutions, use of .sr-only class, color contrast)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

[sonarcloud]

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 SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.39%. Comparing base (a9d010b) to head (8b7d1c2).
Report is 18 commits behind head on skosmos-2.

Additional details and impacted files

@@               Coverage Diff               @@
##             skosmos-2    #1672      +/-   ##
===============================================
+ Coverage        69.65%   70.39%   +0.74%     
+ Complexity        1784     1674     -110     
===============================================
  Files               32       32              
  Lines             4581     4314     -267     
===============================================
- Hits              3191     3037     -154     
+ Misses            1390     1277     -113     

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[osma]

This is such a trivial and obvious fix I will merge it without review.