fix: remove platform-specific error value type

src/error.rs

@@ -51,10 +51,6 @@ impl From<ManifoldError> for Error {
             manifold3d_sys::ManifoldError_MANIFOLD_INVALID_CONSTRUCTION => {
                 Error::InvalidConstruction
             }
-            // These error codes will, with high probability, never reach i32::MAX.
-            #[cfg(windows)]
-            value => Error::Unknown(value as u32),
-            #[cfg(not(windows))]
             value => Error::Unknown(value),
         }
     }