tests: move baduisetup test inside "#if demandimport" The test case depends on the failure happening not at import time, but at uisetup() time, so it doesn't make sense when demandimport is disabled. There was already a section for testing demandimport stuff, so I moved it inside that existing section. As part of the move, I enabled the extension using '--config' so subsequent tests don't get the bad extension enabled. Differential Revision: https://phab.mercurial-scm.org/D526