Disclosure of Email title report in quick award paypout email (no content mode)

Description In report #645264 and #669776, email title disclosure has been fixed in no content settings. However, there is one more area which needs to be fix - "Instant bounty Award Email". In this email, even though email settings have been set as "No content", still it's displaying Report Title.

curl "https://api.hackerone.com/v1/programs/42738/bounties" \
  -X POST \
  -u "dummy:xxxxxxxx" \
  -H "Content-Type: application/json" \
  -d @- <<EOD
    {
      "data": {
        "type": "bounty",
        "attributes": {
          "amount": 100,
          "reference": "aaaaa",
          "title": …