Remove the GetCommonSettings mock

There's some sort of internal issue in boost::test and the turtle mocks that causes test crashes

qa/tests/api/test_api_module.cpp

@@ -46,8 +46,6 @@ bool init_unit_test()
 
         Pgm().InitPgm( true, true, true );
         const MOCK_PGM_BASE& program = static_cast<MOCK_PGM_BASE&>( Pgm() );
-        MOCK_EXPECT( program.GetCommonSettings )
-                .returns( Pgm().GetSettingsManager().GetCommonSettings() );
     }
 
     return ok;