fix(payments): restore default provider connections

tests/test_payment_http_client.py

@@ -2,7 +2,6 @@ import unittest
 
 from bot.payment_providers.shared.http_client import (
     HttpClientMixin,
-    _PAYMENT_REQUEST_USER_AGENT,
     _should_retry_transport_error,
 )
 
@@ -13,13 +12,12 @@ class _DummyHttpClient(HttpClientMixin):
 
 
 class PaymentHttpClientTests(unittest.IsolatedAsyncioTestCase):
-    async def test_http_client_does_not_reuse_provider_tcp_connections(self):
+    async def test_http_client_tracks_sent_headers_for_safe_retries(self):
         client = _DummyHttpClient()
         try:
             session = await client._get_session()
-            self.assertTrue(session.connector.force_close)
+            self.assertFalse(session.connector.force_close)
             self.assertTrue(session.trace_configs)
-            self.assertEqual(session.headers["User-Agent"], _PAYMENT_REQUEST_USER_AGENT)
         finally:
             await client.close()