Fix watch to use orig.tar.gz on package_ubuntu directory

build/debian/watch

@@ -2,4 +2,4 @@
 version=3
 
 #http://sf.net/dolibarr/dolibarr-(.+)\.tgz
-http://www.dolibarr.org/files/stable/standard/dolibarr-(.+)\.tgz
+http://www.dolibarr.org/files/stable/package_debian-ubuntu/dolibarr_(.+)\.orig\.tar\.gz