Add missing PowerMockIgnore annotation

WebSecurityConfigurerAdapterPowermockTests needs to exclude
javax.xml.transform.* from Powermock configuration.

Author: jzheaux

config/src/test/java/org/springframework/security/config/annotation/web/WebSecurityConfigurerAdapterPowermockTests.java

@@ -59,7 +59,7 @@
  */
 @RunWith(PowerMockRunner.class)
 @PrepareForTest({ SpringFactoriesLoader.class, WebAsyncManager.class })
-@PowerMockIgnore({ "org.w3c.dom.*", "org.xml.sax.*", "org.apache.xerces.*", "javax.xml.parsers.*" })
+@PowerMockIgnore({ "org.w3c.dom.*", "org.xml.sax.*", "org.apache.xerces.*", "javax.xml.parsers.*", "javax.xml.transform.*" })
 public class WebSecurityConfigurerAdapterPowermockTests {
 	ConfigurableWebApplicationContext context;