proxy: update to follow new slap/hateoas API

With bd92f809 (slap/hateoas: use new name for portal type
("Compute Node" instead of "Computer"), 2023-11-30) the API changed.

slapos/proxy/views.py

@@ -1084,7 +1084,7 @@ def is_valid(name):
 
 p_service_list = 'portal_type:"Instance Tree" AND validation_state:validated'
 p_service_info = p_service_list + ' AND title:='
-p_computer_list = 'portal_type:"Computer" AND validation_state:validated'
+p_computer_list = 'portal_type:"Compute Node" AND validation_state:validated'
 p_computer_info = p_computer_list + ' AND reference:='
 
 def parse_query(query):