[gimp] app: fix some warnings i introduced in preferences-dialog.c

[Michael Natterer <mitch src gnome org>]

commit 63fce277d0f669ff6725efa1d1535d0b997e5867
Author: Michael Natterer <mitch gimp org>
Date:   Thu Aug 25 23:05:42 2016 +0200

    app: fix some warnings i introduced in preferences-dialog.c

 app/dialogs/preferences-dialog.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/app/dialogs/preferences-dialog.c b/app/dialogs/preferences-dialog.c
index 01cdd26..5d99bce 100644
--- a/app/dialogs/preferences-dialog.c
+++ b/app/dialogs/preferences-dialog.c
@@ -2051,7 +2051,7 @@ prefs_dialog_new (Gimp       *gimp,
   entry = gimp_prop_entry_new (object, "layer-new-name", -1);
   prefs_widget_add_aligned (entry,
                             _("Layer name:"),
-                            GTK_WIDGET (table), 0, FALSE,
+                            GTK_TABLE (table), 0, FALSE,
                             size_group);
 
   prefs_enum_combo_box_add (object, "layer-new-fill-type", 0, 0,
@@ -2079,7 +2079,7 @@ prefs_dialog_new (Gimp       *gimp,
   entry = gimp_prop_entry_new (object, "channel-new-name", -1);
   prefs_widget_add_aligned (entry,
                             _("Channel name:"),
-                            GTK_WIDGET (table), 0, FALSE,
+                            GTK_TABLE (table), 0, FALSE,
                             size_group);
 
   button = prefs_color_button_add (object, "channel-new-color",
@@ -2097,7 +2097,7 @@ prefs_dialog_new (Gimp       *gimp,
   entry = gimp_prop_entry_new (object, "path-new-name", -1);
   prefs_widget_add_aligned (entry,
                             _("Path name:"),
-                            GTK_WIDGET (table), 0, FALSE,
+                            GTK_TABLE (table), 0, FALSE,
                             size_group);
 
   g_object_unref (size_group);