Revert "rewrite old test so that its attributes are consistent with what we want in the language."

This reverts commit b4e77d2.

Author: Mark-Simulacrum

src/test/ui/rfc-2565-param-attrs/param-attrs-allowed.rs

@@ -8,25 +8,25 @@ extern "C" {
         #[allow(unused_mut)] a: i32,
         #[cfg(something)] b: i32,
         #[cfg_attr(something, cfg(nothing))] c: i32,
-        #[forbid(unused_mut)] d: i32,
-        #[deny(unused_mut)] #[warn(unused_mut)] ...
+        #[deny(unused_mut)] d: i32,
+        #[forbid(unused_mut)] #[warn(unused_mut)] ...
     );
 }
 
 type FnType = fn(
     #[allow(unused_mut)] a: i32,
     #[cfg(something)] b: i32,
     #[cfg_attr(something, cfg(nothing))] c: i32,
-    #[forbid(unused_mut)] d: i32,
-    #[deny(unused_mut)] #[warn(unused_mut)] e: i32
+    #[deny(unused_mut)] d: i32,
+    #[forbid(unused_mut)] #[warn(unused_mut)] e: i32
 );
 
 pub fn foo(
     #[allow(unused_mut)] a: i32,
     #[cfg(something)] b: i32,
     #[cfg_attr(something, cfg(nothing))] c: i32,
-    #[forbid(unused_mut)] d: i32,
-    #[deny(unused_mut)] #[warn(unused_mut)] _e: i32
+    #[deny(unused_mut)] d: i32,
+    #[forbid(unused_mut)] #[warn(unused_mut)] _e: i32
 ) {}
 
 // self