Fix the NSFW setting

In the user settings, the temporary NSFW allowance was not detected.
This was due to use of a database lookup instead of the correct
function.

neluser/views.py

@@ -14,6 +14,7 @@ from django.utils.encoding import force_bytes
 from django.http import HttpResponse, Http404
 from django.conf import settings
 from django.urls import reverse_lazy
+from nsfw.views import is_nsfw_allowed
 from .forms import RegistrationForm, ChangePasswordForm, DeleteAccountForm
 from .models import NelUser
 
@@ -27,7 +28,7 @@ def settings_default(request):
 @login_required
 def set_nsfw(request):
     ctx = {
-        'nsfw_allowed': request.user.nsfw_allowed,
+        'nsfw_allowed': is_nsfw_allowed(request),
         'current_url': reverse_lazy('set_nsfw'),
         'tab': 'preferences',
         'active_block': 'nsfw_filter'