[geary] Revert "Fix main window showing a menubar under earlier GTK versions."

[Michael Gratton <mjog src gnome org>]

commit 6e5d85a32b4f3dc6f6de4bdfc605422162dacf57
Author: Michael James Gratton <mike vee net>
Date:   Tue Feb 19 14:07:52 2019 +1100

    Revert "Fix main window showing a menubar under earlier GTK versions."
    
    This reverts commit 062f8205a27e9e643d7eb2893485d7d47fb51416.

 src/client/components/main-window.vala | 5 -----
 1 file changed, 5 deletions(-)
---
diff --git a/src/client/components/main-window.vala b/src/client/components/main-window.vala
index 6bc3a837..e6577fa1 100644
--- a/src/client/components/main-window.vala
+++ b/src/client/components/main-window.vala
@@ -88,11 +88,6 @@ public class MainWindow : Gtk.ApplicationWindow, Geary.BaseInterface {
         Object(application: application);
         base_ref();
 
-        // GTK+ 3.14 (and others?) ignores this property in the UI
-        // file, so set it explicitly here to avoid having a menubar
-        // appear when the desktop shell does not show the app menu
-        this.show_menubar = false;
-
         load_config(application.config);
         restore_saved_window_state();