SQLite / Error: 1 near "IGNORE": syntax error / SMWSQLStore3QueryEngine:...

...:refreshConceptCache

Extends RebuildConceptCacheMaintenanceRegressionTest to reveal a Store failure for Concepts on SQLite
```
1) SMW\Tests\Regression\RebuildConceptCacheMaintenanceRegressionTest::testDataImport
DBQueryError: A database error has occurred. Did you forget to run maintenance/update.php after upgrading?  See: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: INSERT IGNORE INTO unittest_smw_concept_cache SELECT DISTINCT t0.s_id AS s_id, 18 AS o_id FROM unittest_unittest_smw_fpt_inst AS t0 WHERE t0.o_id='2' LIMIT 10000
Function: SMW::refreshConceptCache
Error: 1 near "IGNORE": syntax error
```

Follow-up on #272 to keep cause and fix separated from the original PR.