pylookup: Set one_entry to false after each element

Fix for bug: extraneous links registered for last entry
in index. For instance, for python documentation index,
all links in footer would get attached to `zlib`.

layers/+lang/python/local/pylookup/pylookup.py

@@ -157,6 +157,8 @@ class IndexProcessor(HTMLParser):
     def handle_endtag(self, tag):
         if tag == 'dd':
             self.list_entry = False
+        if tag == 'dt':
+            self.one_entry = False
 
     def handle_data(self, data):
         if self.tag == 'a':