[Bug] Merged PRs appear as closed in Projects view

[delvh]

• Gitea version (or commit ref): 1.13.6 and 1.15.0+dev-65-g0bb8bd819
• Can you reproduce the bug at https://try.gitea.io:
  • Yes here

Description

Merged PRs should be displayed as merged, not as closed.
This however is not the case in the Project View with Gitea 1.13.6 and above (could reproduce the issue on try.gitea.io - PR #7 on the linked page has been merged but gets displayed as closed)

Screenshots

Should be displayed as merged