java: Remove unused field (fix CID 1386094 UrF: Unread field)

desc is written once, but never used otherwise.
Signed-off-by: NStefan Weil <sw@weilnetz.de>

java/com/google/scrollview/ui/SVCheckboxMenuItem.java

@@ -30,7 +30,6 @@ import javax.swing.JCheckBoxMenuItem;
  */
 class SVCheckboxMenuItem extends SVAbstractMenuItem {
   public String value = null;
-  public String desc = null;
   public boolean bvalue;
 
   SVCheckboxMenuItem(int id, String name, boolean val) {