pytest: fix test_recover_plugin flake

It can try to reconnect while we're explicitly connecting:

```
2025-04-15T03:40:53.9184103Z >       l2.rpc.connect(l1.info['id'], 'localhost', l1.port)
2025-04-15T03:40:53.9184311Z 
2025-04-15T03:40:53.9184401Z tests/test_misc.py:3078:
...
2025-04-15T03:40:53.9206302Z >           raise RpcError(method, payload, resp['error'])
2025-04-15T03:40:53.9207225Z E           pyln.client.lightning.RpcError: RPC call failed: method: connect, payload: {'id': '0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518', 'host': 'localhost', 'port': 45219}, error: {'code': 402, 'message': 'disconnected during connection'}
```

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Author: rustyrussell

tests/test_misc.py

@@ -3048,7 +3048,8 @@ def test_recover_plugin(node_factory, bitcoind):
         feerates=(7500, 7500, 7500, 7500),
         options={
             'log-level': 'info',
-            'experimental-peer-storage': None
+            'experimental-peer-storage': None,
+            'dev-no-reconnect': None,
         },
     )
     l2 = node_factory.get_node(
@@ -3058,7 +3059,8 @@ def test_recover_plugin(node_factory, bitcoind):
         allow_bad_gossip=True,
         options={
             'log-level': 'info',
-            'experimental-peer-storage': None
+            'experimental-peer-storage': None,
+            'dev-no-reconnect': None,
         },
     )