Webhook sends wrong milestone in issue milestone change triggered message.

[chriseaton]

• Gitea version (or commit ref): 1.11.4
• Git version: 1.8.3.1
• Operating system: CentOS 7
• Database (use [x]):
  • PostgreSQL
• Can you reproduce the bug at https://try.gitea.io:
  • Yes

Description

When changing the milestone of an issue, the webhook sends the old milestone on the issue instead of the new one.

Example:

1. Issue is assigned to Milestone A.
2. User changes issue to Milestone B.
3. A webhook message is sent saying:

[project] Issue milestoned to Milestone A [issue name] by [user]

The language indicates what the issue was changed to, instead shows what it was changed from.

Expected result:
A webhook message is sent saying:

[project] Issue milestoned to Milestone B [issue name] by [user]