Call url correctly from password_reset_email.txt.

In Jinja2 the url function is called differently. We can't give keyword
arguments directly instead we need to pass them through kwargs argument.

templates/registration/password_reset_email.txt

@@ -1,7 +1,7 @@
 Psst. Word on the street is that you forgot your password, {{ email}}.
 
 It's all good. Follow the link below and we'll take care of the rest:
-    <{{ protocol}}://{{ domain }}{{ url('django.contrib.auth.views.password_reset_confirm', uidb64=uid, token=token) }}>
+    <{{ protocol}}://{{ domain }}{{ url('django.contrib.auth.views.password_reset_confirm', kwargs=dict(uidb64=uid, token=token)) }}>
 
 Thanks,
 Your friends at Zulip HQ