Fix extension/savedqueries

[shinobu]

This pull request removes the require once's out of the extension, makes the description parameter optional (we don't even have an option to add this to a query...) and fixes a missing urlBase Parameter for the phtml file.

[pfrischmuth]

• [x] manual review commits
• [x] check style with phpcs on changed files (vendor/bin/phpcs )
• [x] check unit tests:
  • develop Branch: OK (86 tests, 154 assertions)
  • Pull Request: OK (86 tests, 154 assertions)
• [x] check integration tests mysql:
  • develop Branch: Tests: 27, Assertions: 137, Errors: 1
  • Pull Request: Tests: 27, Assertions: 137, Errors: 1
  • one test fails currently also on develop, will be fixed separately
• [x] check integration tests virtuoso:
  • develop Branch: Tests: 27, Assertions: 138, Errors: 1
  • Pull Request: Tests: 27, Assertions: 138, Errors: 1
  • one test fails currently also on develop, will be fixed separately
• [x] further manual tests:
  • tested OntoWiki with savedqueries extension enabled manually
  • in the develop branch I got an error
  • with this fix applied I see the saved queries module and can save a query as well as execute it

[pfrischmuth]

LGTM