New PR is displayed as new claim for bounty with winner

[churik]

Description

Type: Bug
Summary: after merging initial PR (when winner is set) and reopening issue every PR with keyword in comments, title or commit message displayed as a new claim.
Use case: when concrete PR is merged, but introduces issue and developer reverts it and reopens issue.

Expected behavior

no claims appear after setting winner

Actual behavior

every new PR is displayed as new claim

Reproduction

Prerequisites:

• GH user A - developer-external contributor
• GH user B - organization
• GH user C - developer from organization (with write access)

Steps:

• As user B - create issue with bounty
• As User A - create new PR - claim for the issue
• As user B - merge PR. Issue should close automatically.
• Check issue in Github: winner have to be user B; status - Pending maintainer confirmation.
• As User C revert PR of user B. Specify in commit message, comment or PR title "Fix #issue"
• As user B - reopen issue
• Check "Activity" on https://openbounty.status.im:444

Additional Information

• Browser: Chrome
• Operating System: MacOs High Sierra
• Issue example on staging env: Additional_issue_tocheck_address NewOrGanizationSOB/RepoSOB1_2#77