[gtkmm] demos, tests: Fix minor bugs at calls to Gtk::make_managed()

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 2da2c36aa8bc39806673ab46b2eed8b6df47b348
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Wed Nov 7 15:53:38 2018 +0100

    demos, tests: Fix minor bugs at calls to Gtk::make_managed()
    
    The newly introduced calls to make_managed() contained 2 bugs.

 demos/gtk-demo/example_textview.cc | 2 +-
 tests/delete_cpp_child/main.cc     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/demos/gtk-demo/example_textview.cc b/demos/gtk-demo/example_textview.cc
index 268e3477..b4ed082a 100644
--- a/demos/gtk-demo/example_textview.cc
+++ b/demos/gtk-demo/example_textview.cc
@@ -467,7 +467,7 @@ void Window_EasterEgg::recursive_attach_view(int depth, Gtk::TextView& view, Gli
   if (depth > 4)
     return;
 
-  auto pChildView = Gtk::make_managed<Gtk::TextView(view.get_buffer>());
+  auto pChildView = Gtk::make_managed<Gtk::TextView>(view.get_buffer());
 
   /* Frame is to add a black border around each child view */
   auto pFrame = Gtk::make_managed<Gtk::Frame>();
diff --git a/tests/delete_cpp_child/main.cc b/tests/delete_cpp_child/main.cc
index 3a665124..ca1ced34 100644
--- a/tests/delete_cpp_child/main.cc
+++ b/tests/delete_cpp_child/main.cc
@@ -19,7 +19,7 @@ private:
 AppWindow::AppWindow()
     : m_label (nullptr)
 {
-    auto vbox = Gtk::make_managed<Gtk::Box>(Gtk::ORIENTATION_VERTICAL, 5);
+    auto vbox = Gtk::make_managed<Gtk::Box>(Gtk::Orientation::VERTICAL, 5);
     add(*vbox);
 
     auto button = Gtk::make_managed<Gtk::Button>("Delete Label");