[UIMA-6320] Clean up parent POM

- Merge argLine element back into one line
diff --git a/pom.xml b/pom.xml
index 16ea56a..40b9067 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2765,8 +2765,7 @@
             <groupId>org.apache.maven.plugins</groupId>

             <artifactId>maven-surefire-plugin</artifactId>

             <configuration>

-              <argLine>@{jacoco.argLine} -Xmx@{maven.surefire.heap} -Xms@{maven.surefire.heap}

-                @{maven.surefire.argLine} @{maven.surefire.java9}</argLine>

+              <argLine>@{jacoco.argLine} -Xmx@{maven.surefire.heap} -Xms@{maven.surefire.heap} @{maven.surefire.argLine} @{maven.surefire.java9}</argLine>

             </configuration>

           </plugin>

           <plugin>