changing name of position persistence attribute from [x|y] to screen[x|y]. r:hyatt

xpfe/browser/resources/content/navigator.xul

@@ -41,8 +41,8 @@ Contributor(s): ______________________________________. -->
   windowtype="navigator:browser"
   align="vertical"
   width="640" height="480"
-  x="10" y="10"
-  persist="width height x y"
+  screenX="10" screenY="10"
+  persist="screenX screenY width height"
   ondraggesture="return GeneralDrag(event);"> 
 
 <html:script language="javascript" src="chrome://global/content/strres.js" />