Fix bad-item tests, which I apparently forgot to do

Author: ssbr

src/test/ui/manually_drop_attr/manually_drop-bad-item.rs

@@ -1,8 +1,7 @@
 #![feature(manually_drop_attr)]
 #![forbid(unused_attributes)]
 #![manually_drop]
-//~^ ERROR `manually_drop` attribute cannot be used at crate level
-//~^^ ERROR attribute should be applied to a struct or enum
+//~^ ERROR attribute should be applied to a struct or enum
 
 #[manually_drop]
 //~^ ERROR attribute should be applied to a struct or enum

src/test/ui/manually_drop_attr/manually_drop-bad-item.stderr

@@ -1,5 +1,5 @@
 error: attribute should be applied to a struct or enum
-  --> $DIR/manually_drop-bad-item.rs:7:1
+  --> $DIR/manually_drop-bad-item.rs:6:1
    |
 LL | #[manually_drop]
    | ^^^^^^^^^^^^^^^^
@@ -19,16 +19,5 @@ error: attribute should be applied to a struct or enum
 LL | #![manually_drop]
    | ^^^^^^^^^^^^^^^^^
 
-error: `manually_drop` attribute cannot be used at crate level
-  --> $DIR/manually_drop-bad-item.rs:3:1
-   |
-LL | #![manually_drop]
-   | ^^^^^^^^^^^^^^^^^
-   |
-help: perhaps you meant to use an outer attribute
-   |
-LL | #[manually_drop]
-   |
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors