Update views.py

Revert on changes for compatibility purpose

libreosteoweb/api/views.py

@@ -42,7 +42,7 @@
                          HttpResponseRedirect, Http404, HttpResponseBadRequest)
 from django.core.exceptions import SuspiciousOperation
 from django.shortcuts import resolve_url
-from django.utils.http import is_safe_url
+from django.utils.http import url_has_allowed_host_and_scheme
 from django.utils.translation import gettext_lazy as _
 from django.utils.text import format_lazy
 from django.views import View