script/test_claim_search: fix the import of ClientSession

This is nothing special, it just allows the module
to run without throwing an error on the import.

From
```
from lbry.wallet.client.basenetwork import ClientSession
```

To
```
from lbry.wallet.network import ClientSession
```

scripts/test_claim_search.py

@@ -1,5 +1,5 @@
 import asyncio
-from lbry.wallet.client.basenetwork import ClientSession
+from lbry.wallet.network import ClientSession
 from lbry.wallet.rpc.jsonrpc import RPCError
 import logging
 import json