Follow-up to bug 407044 -- add missing '+' to jar.mn so gnomestripe overrides winstripe for downloads.css

toolkit/themes/gnomestripe/mozapps/jar.mn

@@ -1,7 +1,7 @@
 classic.jar:
 #ifndef MINIMO
 + skin/classic/mozapps/update/update.png            (update/update.png)
-  skin/classic/mozapps/downloads/downloads.css      (downloads/downloads.css)
++ skin/classic/mozapps/downloads/downloads.css      (downloads/downloads.css)
 #ifdef MOZ_PLACES
 + skin/classic/mozapps/places/tagContainerIcon.png  (places/tagContainerIcon.png)
 #endif