Fix support for SMW 7.x in SRFSlideShow::linkFurtherResults

[paladox]

Fixes #1034

[paladox]

https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/4a949cf6f5299e2b22e6372d26c0ee124e4e44b9/src/Query/ResultPrinters/ResultPrinter.php#L654

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.91%. Comparing base (efd567d) to head (5677834).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
formats/carousel/Carousel.php	0.00%	1 Missing ⚠️
formats/slideshow/SRF_SlideShow.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1035   +/-   ##
=========================================
  Coverage     52.91%   52.91%           
  Complexity     2438     2438           
=========================================
  Files            81       81           
  Lines          9275     9275           
=========================================
  Hits           4908     4908           
  Misses         4367     4367           

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