message: tests: Add missing sync_all to wallet_importdescriptors.py
  node1 will sometimes do sendtoaddress before it has received a funding
  transaction which will cause the test to fail. sync_all to ensure it
  gets the transaction first.
diff: @@ -331,6 +331,7 @@ class ImportDescriptorsTest(BitcoinTestFramework):
  assert_equal(wmulti_priv.getwalletinfo()['keypoolsize'], 1000)
  txid = w0.sendtoaddress(addr, 10)
  self.nodes[0].generate(6)
  + self.sync_all()
  send_txid = wmulti_priv.sendtoaddress(w0.getnewaddress(), 8)
  decoded = wmulti_priv.decoderawtransaction(wmulti_priv.gettransaction(send_txid)['hex'])
  assert_equal(len(decoded['vin'][0]['txinwitness']), 4)
  