rpc: call RecalculateBestHeader as part of reconsiderblock

Co-authored-by: Fabian Jahr <fjahr@protonmail.com>

test/functional/rpc_invalidateblock.py

@@ -83,6 +83,8 @@ class InvalidateTest(BitcoinTestFramework):
         self.nodes[1].reconsiderblock(blocks[-4])
         # Should be back at the tip by now
         assert_equal(self.nodes[1].getbestblockhash(), blocks[-1])
+        # Should report consistent blockchain info
+        assert_equal(self.nodes[1].getblockchaininfo()["headers"], self.nodes[1].getblockchaininfo()["blocks"])
 
         self.log.info("Verify that invalidating an unknown block throws an error")
         assert_raises_rpc_error(-5, "Block not found", self.nodes[1].invalidateblock, "00" * 32)