Fix #790 tracker hosts not correct for some .uk trackers

deluge/core/torrent.py

@@ -533,7 +533,7 @@ class Torrent:
 
                 parts = host.split(".")
                 if len(parts) > 2:
-                    if parts[-2] in ("co", "com", "net", "org"):
+                    if parts[-2] in ("co", "com", "net", "org") or parts[-1] in ("uk"):
                         host = ".".join(parts[-3:])
                     else:
                         host = ".".join(parts[-2:])