Query tests: Use query string in name for assertions

This was accidentally changed in I21c43496 to repeat the actual list
rather than the query that generated it.

Change-Id: I2e37451e5f4645bd00ab14f78f9a8748764ce2f4

gerrit-server/src/test/java/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java

@@ -1219,7 +1219,7 @@ public abstract class AbstractQueryChangesTest {
       throws Exception {
     List<ChangeInfo> result = query.get();
     Iterable<Integer> ids = ids(result);
-    assertThat(ids).named(ids.toString())
+    assertThat(ids).named(query.getQuery())
         .containsExactlyElementsIn(ids(changes)).inOrder();
     return result;
   }