Update tests for bare_trait_objects warning.

tests/everything/E0178.fixed.rs

@@ -3,7 +3,7 @@
 trait Foo {}
 
 struct Bar<'a> {
-    w: &'a (Foo + Send),
+    w: &'a (dyn Foo + Send),
 }
 
 fn main() {

tests/everything/E0178.rs

@@ -3,7 +3,7 @@
 trait Foo {}
 
 struct Bar<'a> {
-    w: &'a Foo + Send,
+    w: &'a dyn Foo + Send,
 }
 
 fn main() {

tests/everything/closure-immutable-outer-variable.fixed.rs

@@ -10,7 +10,7 @@
 
 // Point at the captured immutable outer variable
 
-fn foo(mut f: Box<FnMut()>) {
+fn foo(mut f: Box<dyn FnMut()>) {
     f();
 }