Remove grd lines from tables that are used as lines

Fixes issue 3753: Addonbrowser tables have extra cell to the right

Change-Id: I72dc6b97c949ec5272ab7d956e19b4684bfe0ab3
Reviewed-on: http://gerrit.dmdirc.com/874
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/ui_swing/components/addonbrowser/BrowserWindow.java

@@ -156,6 +156,7 @@ public class BrowserWindow extends JDialog implements ActionListener {
                 nameButton.getModel(), ratingButton.getModel(),
                 statusButton.getModel(), filter);
         list.setRowSorter(sorter);
+        list.setShowGrid(false);
 
         try {
             loadData();

src/com/dmdirc/addons/ui_swing/dialogs/channelsetting/TopicHistoryPane.java

@@ -79,6 +79,7 @@ public class TopicHistoryPane extends JPanel implements ListSelectionListener {
             topicHistory.getModel().addRow(new Object[]{new TopicLabel(channel, topic),});
         }
         topicHistory.getSelectionModel().setSelectionInterval(0, 0);
+        topicHistory.setShowGrid(false);
 
         setLayout(new MigLayout("fill, ins 0"));
         add(scrollPane, "hmin 50, hmax 200, wmax 450");