Fix config JS snippet to work with current Iconify

cf. https://docs.iconify.design/api/config.html#using-iconifyproviders

dj_iconify/views.py

@@ -68,15 +68,16 @@ class ConfigView(View):
     def get(self, request: HttpRequest) -> HttpResponse:
         # Guess the base URL by reverse-mapping the URL for a fake icon set
         rev = reverse("iconify_json", kwargs={"collection": "prefix", "format_": "js"})
-        # Iconify SVG Framework expects placeholders {prefix} and {icons} in API URL
-        api_pattern = rev[:-9] + "{prefix}.js?icons={icons}"
+
+        # Iconify SVG Framework expects just the base path to the API
+        api_base = rev[:-10]
 
         # Put together configuration as dict and output as JSON
         config = {
-            "defaultAPI": api_pattern,
+            "resources": api_base,
         }
         config_json = json.dumps(config)
-        return HttpResponse(f"var IconifyConfig = {config_json}", content_type="text/javascript")
+        return HttpResponse("var IconifyProviders = {'': " + config_json + "}", content_type="text/javascript")
 
 
 class CollectionView(BaseJSONView):