nepal_dhangadhi: add retry for 403 erros

Signed-off-by: Yohanna Lisnichuk <yohanitalisnichuk@gmail.com>

kingfisher_scrapy/spiders/nepal_dhangadhi.py

@@ -31,3 +31,11 @@ def parse_list(self, response):
             # A URL might redirect to https://admin.ims.susasan.org/login
             yield self.build_request(pattern.format(item['name']), formatter=components(-1),
                                      meta={'dont_redirect': True})
+
+    def parse(self, response):
+        # if we got a redirect response we try it again to download that file
+        if response.status == 302:
+            yield self.build_request(response.request.url, formatter=components(-1),
+                                     dont_filter=True)
+        else:
+            yield from super().parse(response)