fileserver: show symlink targets verbatim (#7476)

[maxtruxa]

See #7476

reveal_symlinks was exposing symlink targets as fully resolved absolute paths, even if the target is a relative path. With this change the link target is shown as-is, without resolving anything.

Example

tree output:

.
├── abs -> /home/maxtruxa/caddy-test-files/foo
├── foo
├── ind -> sub/rel
├── rel -> foo
└── sub
    └── rel -> ../foo

Before

After

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