fix(tvix/eval): fix the unsafeGetAttrPos stub return value

It was returning `{ line, col, file }` instead of `{ line, column, file
}`.

Note this is not a regression in Nix, Nix always had `column` since
2013.

Change-Id: I4871a201b32324dff0432526d0449806a535828f
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11409
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

tvix/eval/src/builtins/mod.rs

@@ -1716,7 +1716,7 @@ mod placeholder_builtins {
         .await;
         let res = [
             ("line", 42.into()),
-            ("col", 42.into()),
+            ("column", 42.into()),
             ("file", Value::String("/deep/thought".into())),
         ];
         Ok(Value::attrs(NixAttrs::from_iter(res.into_iter())))