Cleanup QSqlTableModelTest: - use pmf QSignalSpy ctor - use QCOMPARE/QCOMPARE_GE instead QVERIFY where possible - properly close additional databases so temporary folders created for sqlite can be deleted on exit Pick-to: 6.9 6.8 Change-Id: I84e8960b81128c141a0e2cd6d03837c9b5ac6652 Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>