set proxySet to true

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@10620 ee4ac58c-ac51-4696-9907-e4b3aa274f04

uk/ac/sanger/artemis/components/alignment/LookSeqPanel.java

@@ -539,6 +539,7 @@ public class LookSeqPanel extends JPanel
     {
       System.getProperties().put("http.proxyHost", proxyHostField.getText().trim());
       System.getProperties().put("http.proxyPort", proxyPortField.getText().trim());
+      System.getProperties().put("proxySet","true");
     }
     
     urlStr = urlStrField.getText().trim();