remove getattr _sp_force_authn default value

Author: MohamedA95

djangosaml2/views.py

@@ -147,7 +147,7 @@ def login(request,
 
     kwargs = {}
     # pysaml needs a string otherwise: "cannot serialize True (type bool)"
-    if getattr(conf, '_sp_force_authn',False):
+    if getattr(conf, '_sp_force_authn'):
         kwargs['force_authn'] = "true"
     if getattr(conf, '_sp_allow_create', "false"):
         kwargs['allow_create'] = "true"