Fix testIsTrashedWithProperty on DBS Memory

java.lang.AssertionError: expected:<8> but was:<0>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:834)
	at org.junit.Assert.assertEquals(Assert.java:645)
	at org.junit.Assert.assertEquals(Assert.java:631)
	at org.nuxeo.ecm.core.TestSQLRepositoryQuery.doTestTrashed(TestSQLRepositoryQuery.java:2158)
	at org.nuxeo.ecm.core.TestSQLRepositoryQuery.testIsTrashedWithProperty(TestSQLRepositoryQuery.java:2134)