"File content is not available" is figured when TextFile which content contains '/annex/objects' strings.

Hi, G-Node/gogs Team.
I'm developer from Japan who fork "G-Node/gogs".

I want to ask you this issue.

**Describe the bug**

1. go myRepository page.
2. click "New File" button.
3. enter filename(issue.txt) and contents of this text file.
this text file contetns is "this text contains '/annex/objects' strings".


4. commit this text file.
5. figured "File content is not available" sentence and i cant see text file's contents.


**GIN version and commit**
Live branch which tags [gin-live-2020-10-24](https://github.com/G-Node/gogs/releases/tag/gin-live-2020-10-24)

**Operating system**
Linux ubuntu 5.15.0-41-generic #44~20.04.1-Ubuntu SMP Fri Jun 24 13:27:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

**Database**
postgres

**To Reproduce**
show you in "Describe the bug" chapter

**Expected behavior**
can get and see the file contents.

**Actual behavior**
can't get and see the file contents.

**Additional context**
I think this contents is treated as Git-Aneexed contents.
when I look source code (internal\tool\file.go), it said.


This code treats git-saved text file which contains '/annex/objects' strings as git-Aneex saved file.
Is this code right?

I want to know the reason why this judgementis needed.
What kind of cases require this judgement?

I think git-annex saved file is symlink.
So, It's enough to check symlink or not.

If there are any mistakes in my understanding please let me know.

sincerely yours,
Nozomu Akaike.