fix for unix file picker not handling null window parents bug 34328 r=brendan, slamm

fix for mailnews' file->save as dialog not saving files on unix in due to its handling of file extentions and filters.  this code now uses nsIFilePicker.  fixes nsbeta2+ bug 31096. r=mscott

suite/browser/navigator.js

@@ -803,7 +803,7 @@ function RevealSearchPanel()
     try {
       var fp = Components.classes["component://mozilla/filepicker"].createInstance(nsIFilePicker);
       fp.init(window, bundle.GetStringFromName("openFile"), nsIFilePicker.modeOpen);
-      fp.setFilters(nsIFilePicker.filterHTML | nsIFilePicker.filterText | 
+      fp.appendFilters(nsIFilePicker.filterHTML | nsIFilePicker.filterText | 
 			nsIFilePicker.filterAll | nsIFilePicker.filterImages | nsIFilePicker.filterXML);
       if (fp.show() == nsIFilePicker.returnOK) {
         openNewWindowWith(fp.fileURL.spec);