[pom] Fix maven-surefire-plugin argLine so jacoco works

Author: hazendaz

pom.xml

@@ -252,7 +252,7 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Xmx1024m</argLine>
+          <argLine>${argLine} -Xmx1024m</argLine>
           <systemProperties>
             <property>
               <name>derby.stream.error.file</name>