FOP-2875: fix checkstyle issue

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1863871 13f79535-47bb-0310-9956-ffa450edef68

fop-core/src/test/java/org/apache/fop/pdf/PDFLibraryTestSuite.java

 
 package org.apache.fop.pdf;
 
-import org.apache.fop.render.pdf.extensions.PDFEmbeddedFileAttachmentTest;
 import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
 import org.junit.runners.Suite.SuiteClasses;
 
+import org.apache.fop.render.pdf.extensions.PDFEmbeddedFileAttachmentTest;
+
 /**
  * Test suite for FOP's utility classes.
  */