Fixes previous commit: Call and Chat Conference Invite Dialog enhancements:

- Added the possibility to add contacts, which are not in the contact list.
- Filter contact list contacts already added in a conference.

src/net/java/sip/communicator/util/util.manifest.mf

@@ -17,6 +17,7 @@ Import-Package: org.xml.sax,
  javax.swing.text,
  javax.swing.plaf.basic,
  javax.swing.plaf,
+ javax.swing.plaf.metal,
  javax.swing.event,
  javax.swing.border,
  javax.swing,