Remove some warnings in CertificatePanel

Change-Id: Ia8aa0f5cce6e656e4c2dd06f40a4714782ed816c
Reviewed-on: http://gerrit.dmdirc.com/3138
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

src/com/dmdirc/addons/ui_swing/components/renderers/CertificateChainEntryCellRenderer.java

 /**
  * Renderer for Certificate chain entries, shows the verified icon and name.
  */
-public class CertificateChainEntryCellRenderer extends DMDircListCellRenderer {
+public class CertificateChainEntryCellRenderer extends DMDircListCellRenderer<CertificateChainEntry> {
 
     /** Serial version UID. */
     private static final long serialVersionUID = 1;
      * @param renderer    Parent renderer
      */
     public CertificateChainEntryCellRenderer(final IconManager iconManager,
-            final ListCellRenderer renderer) {
+            final ListCellRenderer<? super CertificateChainEntry> renderer) {
         super(renderer);
         icon = iconManager.getIcon("nothing");
         trustedIcon = iconManager.getIcon("tick");

src/com/dmdirc/addons/ui_swing/dialogs/sslcertificate/CertificateChainPanel.java

     /** Icon manager. */
     private final IconManager iconManager;
     /** Chain list. */
-    private JList list;
+    private JList<CertificateChainEntry> list;
     /** List model. */
-    private DefaultListModel model;
+    private DefaultListModel<CertificateChainEntry> model;
 
     /**
      * Creates a new certificate chain panel.
     }
 
     private void initComponents() {
-        model = new DefaultListModel();
-        list = new JList(model);
+        model = new DefaultListModel<>();
+        list = new JList<>(model);
         list.setCellRenderer(new CertificateChainEntryCellRenderer(iconManager,
                 list.getCellRenderer()));
         list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      * @return Name of specified index
      */
     public String getName(final int index) {
-        return ((CertificateChainEntry) model.get(index)).getName();
+        return model.get(index).getName();
     }
 
     /**