x11-wm/durden: unbreak fetch due to recompression

> Fetched file size mismatch (expected 3361452, actual 3361450)

$ gzip -lv letoram-durden-0.6.1_GH0.tar.gz
method crc date time compressed uncompressed ratio uncompressed_name
-defla 583d73c2 Dec 6 10:55 3361452 5089280 33.9% letoram-durden-0.6.1_GH0.tar
+defla 54cb8662 May 4 15:31 3361450 5089280 33.9% letoram-durden-0.6.1_GH0.tar