NFC: Remove unneeded #cfg(...) in digest_tests.rs

The code is always enabled since "wasm32" was spelled wrongly. Apparently
the wasm-bindgen compatibility issue is no longer an issue.

Author: briansmith

tests/digest_tests.rs

@@ -46,8 +46,6 @@ fn digest_misc() {
     });
 }
 
-// wasm_bindgen doesn't build this correctly.
-#[cfg(not(target_arch = "wsam32"))]
 mod digest_shavs {
     use ring::{digest, test};