refactor(tvix/eval): remove useless impl block

There's no need to duplicate this.

Change-Id: If3d930211a1d625d6c7ef129b05034e7a915da83
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12385
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: Yury Shvedov <yury.shvedov@kaspersky.com>

tvix/eval/src/value/mod.rs

@@ -210,14 +210,6 @@ where
     }
 }
 
-/// Constructors
-impl Value {
-    /// Construct a [`Value::Attrs`] from a [`NixAttrs`].
-    pub fn attrs(attrs: NixAttrs) -> Self {
-        Self::Attrs(Box::new(attrs))
-    }
-}
-
 /// Controls what kind of by-pointer equality comparison is allowed.
 ///
 /// See `//tvix/docs/value-pointer-equality.md` for details.
@@ -234,6 +226,11 @@ pub enum PointerEquality {
 }
 
 impl Value {
+    /// Construct a [`Value::Attrs`] from a [`NixAttrs`].
+    pub fn attrs(attrs: NixAttrs) -> Self {
+        Self::Attrs(Box::new(attrs))
+    }
+
     /// Deeply forces a value, traversing e.g. lists and attribute sets and forcing
     /// their contents, too.
     ///