Revert "[fix] fix KeyError: 'ipv6'"

This reverts commit 4a187d41be.

tests/unit/network/test_network.py

@@ -4,15 +4,12 @@ from mock import patch
 
 import httpx
 
-from searx.network.network import Network, NETWORKS, initialize
+from searx.network.network import Network, NETWORKS
 from searx.testing import SearxTestCase
 
 
 class TestNetwork(SearxTestCase):
 
-    def setUp(self):
-        initialize()
-
     def test_simple(self):
         network = Network()