Revert "Adapt ui-fulldeps test."

This reverts commit 69205db.

Author: compiler-errors

src/test/ui-fulldeps/pprust-expr-roundtrip.rs

@@ -73,10 +73,10 @@ fn iter_exprs(depth: usize, f: &mut dyn FnMut(P<Expr>)) {
             2 => {
                 let seg = PathSegment::from_ident(Ident::from_str("x"));
                 iter_exprs(depth - 1, &mut |e| {
-                    g(ExprKind::MethodCall(seg.clone(), e, vec![make_x()], DUMMY_SP))
+                    g(ExprKind::MethodCall(seg.clone(), vec![e, make_x()], DUMMY_SP))
                 });
                 iter_exprs(depth - 1, &mut |e| {
-                    g(ExprKind::MethodCall(seg.clone(), make_x(), vec![e], DUMMY_SP))
+                    g(ExprKind::MethodCall(seg.clone(), vec![make_x(), e], DUMMY_SP))
                 });
             }
             3..=8 => {