pytest: fix flake in test_restorefrompeer.

Just because we've seen the block doesn't mean onchaind has finished
starting up.

```
 _____________________________ test_restorefrompeer _____________________________
[gw0] linux -- Python 3.10.15 /home/runner/.cache/pypoetry/virtualenvs/cln-meta-project-AqJ9wMix-py3.10/bin/python

node_factory = <pyln.testing.utils.NodeFactory object at 0x7fb8f3887f70>
bitcoind = <pyln.testing.utils.BitcoinD object at 0x7fb8f3886f50>

    @unittest.skipIf(os.getenv('TEST_DB_PROVIDER', 'sqlite3') != 'sqlite3', "deletes database, which is assumed sqlite3")
    def test_restorefrompeer(node_factory, bitcoind):
        """
        Test restorefrompeer
        """
        l1, l2 = node_factory.get_nodes(2, [{'broken_log': 'ERROR: Unknown commitment #.*, recovering our funds!',
                                             'experimental-peer-storage': None,
                                             'may_reconnect': True,
                                             'allow_bad_gossip': True},
                                            {'experimental-peer-storage': None,
                                             'may_reconnect': True}])
    
        l1.rpc.connect(l2.info['id'], 'localhost', l2.port)
    
        c12, _ = l1.fundchannel(l2, 10**5)
        assert l1.daemon.is_in_log('Peer storage sent!')
        assert l2.daemon.is_in_log('Peer storage sent!')
    
        l1.stop()
        os.unlink(os.path.join(l1.daemon.lightning_dir, TEST_NETWORK, "lightningd.sqlite3"))
    
        l1.start()
        assert l1.daemon.is_in_log('Server started with public key')
    
        # If this happens fast enough, connect fails with "disconnected
        # during connection"
        try:
            l1.rpc.connect(l2.info['id'], 'localhost', l2.port)
        except RpcError as err:
            assert "disconnected during connection" in err.error['message']
    
        l1.daemon.wait_for_log('peer_in WIRE_YOUR_PEER_STORAGE')
    
        assert l1.rpc.restorefrompeer()['stubs'][0] == _['channel_id']
    
        l1.daemon.wait_for_log('peer_out WIRE_ERROR')
        l2.daemon.wait_for_log('State changed from CHANNELD_NORMAL to AWAITING_UNILATERAL')
    
        bitcoind.generate_block(5, wait_for_mempool=1)
        sync_blockheight(bitcoind, [l1, l2])
    
        l1.daemon.wait_for_log(r'All outputs resolved.*')
        wait_for(lambda: l1.rpc.listfunds()["channels"][0]["state"] == "ONCHAIN")
    
        # Check if funds are recovered.
        assert l1.rpc.listfunds()["channels"][0]["state"] == "ONCHAIN"
>       assert l2.rpc.listfunds()["channels"][0]["state"] == "ONCHAIN"
E       AssertionError: assert 'FUNDING_SPEND_SEEN' == 'ONCHAIN'
E         - ONCHAIN
E         + FUNDING_SPEND_SEEN

tests/test_misc.py:3044: AssertionError
```

Signed-off-by: Rusty Russell <[email protected]>

tests/test_misc.py

@@ -3040,8 +3040,8 @@ def test_restorefrompeer(node_factory, bitcoind):
     wait_for(lambda: l1.rpc.listfunds()["channels"][0]["state"] == "ONCHAIN")
 
     # Check if funds are recovered.
-    assert l1.rpc.listfunds()["channels"][0]["state"] == "ONCHAIN"
-    assert l2.rpc.listfunds()["channels"][0]["state"] == "ONCHAIN"
+    wait_for(lambda: l1.rpc.listfunds()["channels"][0]["state"] == "ONCHAIN")
+    wait_for(lambda: l2.rpc.listfunds()["channels"][0]["state"] == "ONCHAIN")
 
 
 def test_commitfee_option(node_factory):