Further tweaks to modal dialogs look

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/branches/irrlicht@4003 178a84e3-b1eb-0310-8ba1-8eac791a3b58

data/gui/skins/glass.stkskin

@@ -162,7 +162,7 @@ when the border that intersect at this corner are enabled.
 <color type="text" state="focused" r="255" g="255" b="255" />
 
 <!-- Color used to fade out background when a dialog is shown -->
-<color type="dialog_background" state="neutral" a="100" r="255" g="255" b="255" />
+<color type="dialog_background" state="neutral" a="120" r="0" g="0" b="0" />
 
 <!-- Text field color -->
 <color type="text_field" state="neutral" a="100" r="150" g="150" b="150" />