Don't include default message to send_error()

Python can provide this for us, so avoid duplication.

tests/test_websockifyserver.py

@@ -86,7 +86,7 @@ class WebSockifyRequestHandlerTestCase(unittest.TestCase):
             FakeSocket(b'GET /tmp.txt HTTP/1.1'), '127.0.0.1', server)
 
         handler.do_GET()
-        send_error.assert_called_with(405, ANY)
+        send_error.assert_called_with(405)
 
     @patch('websockify.websockifyserver.WebSockifyRequestHandler.send_error')
     def test_list_dir_with_file_only_returns_error(self, send_error):
@@ -96,7 +96,7 @@ class WebSockifyRequestHandlerTestCase(unittest.TestCase):
 
         handler.path = '/'
         handler.do_GET()
-        send_error.assert_called_with(404, ANY)
+        send_error.assert_called_with(404)
 
 
 class WebSockifyServerTestCase(unittest.TestCase):

websockify/websockifyserver.py

@@ -250,13 +250,13 @@ class WebSockifyRequestHandler(WebSocketRequestHandlerMixIn, SimpleHTTPRequestHa
             self.auth_connection()
 
         if self.only_upgrade:
-            self.send_error(405, "Method Not Allowed")
+            self.send_error(405)
         else:
             super().do_GET()
 
     def list_directory(self, path):
         if self.file_only:
-            self.send_error(404, "No such file")
+            self.send_error(404)
         else:
             return super().list_directory(path)
 
@@ -277,7 +277,7 @@ class WebSockifyRequestHandler(WebSocketRequestHandlerMixIn, SimpleHTTPRequestHa
             self.auth_connection()
 
         if self.only_upgrade:
-            self.send_error(405, "Method Not Allowed")
+            self.send_error(405)
         else:
             super().do_HEAD()