BAEL-2804 Fixed XML indentation

I've set the XML indentation the same way as the rest of the modules
using 4 spaces instead of 2.

persistence-modules/java-jpa-2/pom.xml

@@ -34,7 +34,7 @@
             <version>${javax.persistence-api.version}</version>
         </dependency>
 
-    <!--Runtime JPA implementation-->
+        <!--Runtime JPA implementation -->
         <dependency>
             <groupId>org.eclipse.persistence</groupId>
             <artifactId>eclipselink</artifactId>

persistence-modules/java-jpa-2/src/main/resources/META-INF/persistence.xml

@@ -15,16 +15,20 @@
                 value="org.h2.Driver" />
             <property name="javax.persistence.jdbc.url"
                 value="jdbc:h2:mem:test" />
-      <property name="javax.persistence.jdbc.user" value="sa" />
-      <property name="javax.persistence.jdbc.password" value="" />
+            <property name="javax.persistence.jdbc.user"
+                value="sa" />
+            <property name="javax.persistence.jdbc.password"
+                value="" />
             <property name="hibernate.dialect"
                 value="org.hibernate.dialect.H2Dialect" />
             <property name="hibernate.hbm2ddl.auto"
                 value="create-drop" />
             <property name="show_sql" value="true" />
             <property
-        name="hibernate.temp.use_jdbc_metadata_defaults" value="false" />
-      <property name="javax.persistence.sql-load-script-source"
+                name="hibernate.temp.use_jdbc_metadata_defaults"
+                value="false" />
+            <property
+                name="javax.persistence.sql-load-script-source"
                 value="queryparams.sql" />
         </properties>
     </persistence-unit>

persistence-modules/java-jpa-2/src/main/resources/logback.xml

@@ -3,7 +3,8 @@
     <appender name="STDOUT"
         class="ch.qos.logback.core.ConsoleAppender">
         <encoder>
-      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} -
+                %msg%n
             </pattern>
         </encoder>
     </appender>