change/bless a test

Author: LorrensP-2158466

tests/ui/proc-macro/derive-helper-legacy-spurious.rs

@@ -6,7 +6,7 @@
 extern crate test_macros;
 
 #[derive(Empty)]
-#[empty_helper] //~ ERROR cannot find attribute `empty_helper` in this scope
+#[empty_helper]
 struct Foo {}
 
 fn main() {}

tests/ui/proc-macro/derive-helper-legacy-spurious.stderr

@@ -4,11 +4,5 @@ error: cannot find attribute `dummy` in this scope
 LL | #![dummy]
    |    ^^^^^
 
-error: cannot find attribute `empty_helper` in this scope
-  --> $DIR/derive-helper-legacy-spurious.rs:9:3
-   |
-LL | #[empty_helper]
-   |   ^^^^^^^^^^^^
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error