Fix search_rec_name for negative operator

In case of negative operator, each subclause must be composed with 'AND'.

issue4559
review11171002

commission.py

@@ -64,7 +64,11 @@ class Agent(ModelSQL, ModelView):
 
     @classmethod
     def search_rec_name(cls, name, clause):
-        return ['OR',
+        if clause[1].startswith('!') or clause[1].startswith('not '):
+            bool_op = 'AND'
+        else:
+            bool_op = 'OR'
+        return [bool_op,
             ('party',) + tuple(clause[1:]),
             ('plan',) + tuple(clause[1:]),
             ]