Fix clippy complaining when used instead of cargo check with RA

ablescript/src/lib.rs

@@ -2,7 +2,8 @@
 //! <https://git.ablecorp.us/AbleScript/able-script> for more
 //! information.
 
-#![forbid(unsafe_code, clippy::unwrap_used)]
+#![forbid(unsafe_code)]
+#![cfg_attr(not(test), forbid(clippy::unwrap_used))]
 
 pub mod ast;
 pub mod error;