Bug #279150 --> fix regression in RSS date handling introduced by my last patch.

mail/extensions/newsblog/content/FeedItem.js

@@ -126,6 +126,11 @@ FeedItem.prototype =
     this.mURL = uri.spec;
   },
 
+  set date (aVal)
+  {
+    this.mDate = aVal;
+  },
+
   get identity ()
   {
     return this.feed.name + ": " + this.title + " (" + this.id + ")"