[gimp] plug-ins: kill GtkAlignment in cml-explorer

[Michael Natterer <mitch src gnome org>]

commit dac5be6108b744f34293fd725920bf2f58501c8f
Author: Michael Natterer <mitch gimp org>
Date:   Sat Oct 20 13:55:42 2018 +0200

    plug-ins: kill GtkAlignment in cml-explorer

 plug-ins/common/cml-explorer.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/plug-ins/common/cml-explorer.c b/plug-ins/common/cml-explorer.c
index 4af09658f2..8d57ec4372 100644
--- a/plug-ins/common/cml-explorer.c
+++ b/plug-ins/common/cml-explorer.c
@@ -1210,13 +1210,10 @@ CML_explorer_dialog (void)
   gtk_box_pack_start (GTK_BOX (hbox), vbox, FALSE, FALSE, 0);
   gtk_widget_show (vbox);
 
-  abox = gtk_alignment_new (0.5, 0.5, 0.0, 0.0);
-  gtk_box_pack_start (GTK_BOX (vbox), abox, FALSE, FALSE, 0);
-  gtk_widget_show (abox);
-
   frame = gtk_frame_new (NULL);
   gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
-  gtk_container_add (GTK_CONTAINER (abox), frame);
+  gtk_widget_set_halign (frame, GTK_ALIGN_CENTER);
+  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
   gtk_widget_show (frame);
 
   preview = gimp_preview_area_new ();