Revert "Experimental nook fix" (experiment failed)

This reverts commit 4edd127175411f84b1c94ee3b1b6f7b1bfb1a1e1.

src/org/fdroid/fdroid/FDroid.java

@@ -113,9 +113,6 @@ public class FDroid extends TabActivity implements OnItemClickListener,
 
         categories = new ArrayAdapter<String>(this,
                 android.R.layout.simple_spinner_item, new Vector<String>());
-        // Add a dummy item to see if this prevents a strange crash on a
-        // rooted nook (issue #88)
-        categories.add("empty");
         categories
                 .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);