Revert "Remove set wallpaper context item"

This reverts commit fa286747cae4c65080a88635287dde63ececbeff.
diff --git a/res/menu/browsercontext.xml b/res/menu/browsercontext.xml
index e507796..a8ae5c8 100644
--- a/res/menu/browsercontext.xml
+++ b/res/menu/browsercontext.xml
@@ -50,6 +50,8 @@
             android:title="@string/contextmenu_download_image"/>
         <item android:id="@+id/view_image_context_menu_id"
             android:title="@string/contextmenu_view_image"/>
+        <item android:id="@+id/set_wallpaper_context_menu_id"
+            android:title="@string/contextmenu_set_wallpaper"/>
     </group>
     <group android:id="@+id/SELECT_TEXT_MENU">
         <item android:id="@+id/select_text_menu_id"