misc: fix pylint consider-using-max-builtin warning (#53405)

pylint.rc

@@ -11,7 +11,6 @@ disable=
     attribute-defined-outside-init,
     broad-except,
     consider-using-dict-comprehension,
-    consider-using-max-builtin,
     consider-using-set-comprehension,
     consider-using-with,
     cyclic-import,

wcs/formdef.py

@@ -1076,8 +1076,7 @@ class FormDef(StorableObject):
         # fix max_field_id if necessary
         if formdef.max_field_id is not None:
             max_field_id = max([lax_int(x.id) for x in formdef.fields])
-            if formdef.max_field_id < max_field_id:
-                formdef.max_field_id = max_field_id
+            formdef.max_field_id = max(max_field_id, formdef.max_field_id)
 
         # check if all field id are unique
         known_field_ids = set()