Fix tests

Author: fanzier

src/test/ui/destructuring-assignment/struct_destructure_fail.stderr

@@ -10,7 +10,7 @@ error: functional record updates are not allowed in destructuring assignments
   --> $DIR/struct_destructure_fail.rs:14:19
    |
 LL |     Struct { a, ..d } = Struct { a: 1, b: 2 };
-   |                   ^ help: consider removing the trailing expression
+   |                   ^ help: consider removing the trailing pattern
 
 error: base expression required after `..`
   --> $DIR/struct_destructure_fail.rs:16:19

src/test/ui/destructuring-assignment/warn-unused-duplication.stderr

@@ -11,3 +11,5 @@ LL | #![warn(unused_assignments)]
    |         ^^^^^^^^^^^^^^^^^^
    = help: maybe it is overwritten before being read?
 
+warning: 1 warning emitted
+