pbrd: fix map seq installed flag in json

pbrd: fix map seq installed flag in json

Ticket:#3638598
Testing:

Post fix:
tor-2# show pbr map json
[
  {
    "name":"global-vrf-PBR-map",
    "valid":true,
    "policies":[
      {
        "id":1,
        "sequenceNumber":10,
        "ruleNumber":309,
        "vrfUnchanged":false,
        "installed":true,   <<<< now display correct value
        "installedReason":"Valid",
        "vrfName":"sym_1",
        "matchSrc":"10.1.200.0\/24",
        "matchDst":"10.6.200.0\/24"
      }
    ]
  }

Signed-off-by: Chirag Shah <chirag@nvidia.com>
(cherry picked from commit 64745d413ccf0b87df540bcf9e8a2b1dcbb893e2)