Reverted vec![] change in pretty print test

Sadly it looks like pretty printing still wants vec![]s to be vec!()s :(

This is something that should be fixed at another time.

src/test/pretty/stmt_expr_attributes.rs

@@ -230,7 +230,7 @@ fn _11() {
     let t = Bar(());
     let _ = #[attr] t.0;
     let _ = (#[attr] t).0;
-    let v = vec![0];
+    let v = vec!(0);
     let _ = #[attr] v[0];
     let _ = (#[attr] v)[0];
     let _ = #[attr] 0..#[attr] 0;