Changing a commit link during a proposal review does not update the commit hash

[bluec0re]

Describe the bug
When a commit link is updated while a proposal is in review, the commit hash does not change.

To Reproduce
Steps to reproduce the behavior:

1. User: Create a new proposal for an entry w/o commit link
2. User: Enter a new commit link
3. User: Request review
4. Reviewer: Provide feedback
5. User: Change commit link
6. Reviewer & Admin: Approve and publish

Expected behavior
The detail view of the vulnerability shows the patch for the new commit link.

Observed behavior
The detail view of the vulnerability shows the patch of the previous hash.

Screenshots
https://www.vulncode-db.com/CVE-2018-7160

Additional context
Seems like the commit_hash column is not updated. Might happen in other situations as well