GPG-Keys don't get deleted when deleting an account

[je-s]

• Gitea version: 8733384
• Git version: Not relevant
• Operating system: Alpine Linux 3.7
• Database:
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes
  • No
  • Not relevant

Description

When you delete a profile with an existing GPG-Key, you can't use this GPG-Key in a new account again. An error says "A public GPG key with same ID already exists.", and it can't be added.
Deleting a Key alone (not the whole account) and adding it again manually is no problem; My guess is that in the process of the account deletion, the GPG-Keys don't get deleted as well.

Screenshots

[je-s]

PR #5357 provided a quick fix for this problem.
We've already tested it successfully.