[BUG] LFS Render displays as text

[kdumontnu]

• Gitea version (or commit ref): 1.14.0+dev-658-g3c965c3e
• Git version:
• Operating system: Windows, Linux + Docker
  See this issue deployed in linux + docker and recreated it locally on windows running form binary
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No (is LFS disabled for try.gitea.io?)
• Log gist: https://gist.github.com/kdumontnu/ab0d8635f71dc02d4611b00e0139e92a

Description

When viewing an LFS file in gitea, the view now shows as text instead of the file (see a jpg below). Presumably the mimetest function is getting the pointer file instead of the actual LFS file.

Screenshots