Use pk_url_kwarg to resolve pk in generic EditView

wagtail/admin/views/generic/models.py

@@ -716,9 +716,9 @@ class EditView(
         return self.actions
 
     def get_object(self, queryset=None):
-        if "pk" not in self.kwargs:
-            self.kwargs["pk"] = self.args[0]
-        self.kwargs["pk"] = unquote(str(self.kwargs["pk"]))
+        if self.pk_url_kwarg not in self.kwargs:
+            self.kwargs[self.pk_url_kwarg] = self.args[0]
+        self.kwargs[self.pk_url_kwarg] = unquote(str(self.kwargs[self.pk_url_kwarg]))
         return super().get_object(queryset)
 
     def get_page_subtitle(self):