Fix AccessControlException caused by using System.exit() in applet mode, and close viewer properly in several other cases.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4965 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/java/com/tigervnc/vncviewer/F8Menu.java b/java/com/tigervnc/vncviewer/F8Menu.java
index b346db9..5d804b5 100644
--- a/java/com/tigervnc/vncviewer/F8Menu.java
+++ b/java/com/tigervnc/vncviewer/F8Menu.java
@@ -85,7 +85,7 @@
 
   public void actionPerformed(ActionEvent ev) {
     if (actionMatch(ev, exit)) {
-      cc.deleteWindow();
+      cc.close();
     } else if (actionMatch(ev, fullScreen)) {
       cc.toggleFullScreen();
     } else if (actionMatch(ev, restore)) {