test: fix intermittent failure in wallet_reorgrestore.py

...by adding a missing sync_blocks call.
There was a race at node2 between connecting the block
produced by node 0, and using -generate to create new blocks
itself. In the failed run, the latter happened first,
resulting in a final block height that was smaller by 1 than
expected.

test/functional/wallet_reorgsrestore.py

@@ -45,6 +45,7 @@ class ReorgsRestoreTest(BitcoinTestFramework):
         txid = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), Decimal("10"))
         tx = self.nodes[0].gettransaction(txid)
         self.generate(self.nodes[0], 4, sync_fun=self.no_op)
+        self.sync_blocks([self.nodes[0], self.nodes[2]])
         tx_before_reorg = self.nodes[0].gettransaction(txid)
         assert_equal(tx_before_reorg["confirmations"], 4)