[pom] Use ${project.build.directory} rather than directly using target

Author: hazendaz

pom.xml

@@ -260,7 +260,7 @@
           <systemProperties>
             <property>
               <name>derby.stream.error.file</name>
-              <value>target/derby.log</value>
+              <value>${project.build.directory}/derby.log</value>
             </property>
           </systemProperties>
         </configuration>