Fix issue with cover images introduced during the merge of #1277.

cps/kobo.py

@@ -949,12 +949,15 @@ def HandleInitRequest():
                                                                        book_uuid="{ImageId}",
                                                                        width="{width}",
                                                                        height="{height}",
+                                                                       Quality='{Quality}',
+                                                                       isGreyscale='isGreyscale',
                                                                        _external=True))
         kobo_resources["image_url_template"] = unquote(url_for("kobo.HandleCoverImageRequest",
                                                                auth_token=kobo_auth.get_auth_token(),
                                                                book_uuid="{ImageId}",
                                                                width="{width}",
                                                                height="{height}",
+                                                               isGreyscale='false',
                                                                _external=True))