Don't unnecessarily suggest unsafe block

Author: SabrinaJewson

clippy_lints/src/transmute/transmute_ref_to_ref.rs

@@ -41,7 +41,7 @@ pub(super) fn check<'tcx>(
                     &format!("transmute from a `{}` to a `{}`", from_ty, to_ty),
                     "consider using",
                     if const_context {
-                        format!("unsafe {{ std::str::from_utf8_unchecked{postfix}({snippet}) }}")
+                        format!("std::str::from_utf8_unchecked{postfix}({snippet})")
                     } else {
                         format!("std::str::from_utf8{postfix}({snippet}).unwrap()")
                     },

tests/ui/transmute.stderr

@@ -244,7 +244,7 @@ error: transmute from a `&[u8]` to a `&str`
   --> $DIR/transmute.rs:142:30
    |
 LL |     const _: &str = unsafe { std::mem::transmute(B) };
-   |                              ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `unsafe { std::str::from_utf8_unchecked(B) }`
+   |                              ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::str::from_utf8_unchecked(B)`
 
 error: aborting due to 39 previous errors