Use correct content.

src/test/java/ch/psi/daq/test/queryrest/controller/QueryRestControllerTest.java

@@ -171,8 +171,6 @@ public class QueryRestControllerTest extends AbstractDaqRestTest {
       String content = mapper.writeValueAsString(request);
       System.out.println(content);
 
-      content = "{\"channels\":[\"testChannel1\",\"testChannel2\"],\"startPulseId\":100,\"endPulseId\":101}";
-
       this.mockMvc
             .perform(MockMvcRequestBuilders
                   .post(QueryRestController.QUERY)