webhooks/jira: Decode topics on our end.

The problem addressed in 006e47198c
resurfaces with topics when a user provides a custom topic in the
webhook URL.

zerver/webhooks/jira/tests.py

@@ -66,6 +66,14 @@ class JiraHookTests(WebhookTestCase):
         self.assertEqual(msg.content, expected_message)
         self.assertEqual(msg.topic_name(), expected_topic)
 
+    def test_created_with_topic_with_spaces_double_escaped(self) -> None:
+        self.url = self.build_webhook_url(topic=quote(quote('alerts test')))
+        expected_topic = "alerts test"
+        expected_message = """Leo Franchi **created** [BUG-15](http://lfranchi.com:8080/browse/BUG-15) priority Major, assigned to **no one**:
+
+> New bug with hook"""
+        self.send_and_test_stream_message('created_v1', expected_topic, expected_message)
+
     def test_created_with_unicode(self) -> None:
             expected_topic = u"BUG-15: New bug with à hook"
             expected_message = u"""Leo Franchià **created** [BUG-15](http://lfranchi.com:8080/browse/BUG-15) priority Major, assigned to **no one**:

zerver/webhooks/jira/view.py

@@ -243,5 +243,5 @@ def api_jira_webhook(request: HttpRequest, user_profile: UserProfile,
 
     check_send_webhook_message(request, user_profile,
                                subject, content,
-                               unquote_stream=True)
+                               unquote_url_parameters=True)
     return json_success()