plug-ins: GimpProcBrowserDialog with "use-header-bar" in Python-console.

We have code for this in gimp_proc_browser_dialog_new(), but it cannot
be moved in the object init() because this is a construction-time only
property. So this needs to be passed from the python call too.

plug-ins/python/python-console/python-console.py

@@ -170,7 +170,7 @@ def run(procedure, args, data):
 
         def browse(self):
             if not self.browse_dlg:
-                dlg = Gimp.ProcBrowserDialog()
+                dlg = Gimp.ProcBrowserDialog(use_header_bar=True)
                 Gtk.Window.set_title(dlg, _("Python Procedure Browser"))
                 Gtk.Window.set_role(dlg, PROC_NAME)
                 Gtk.Dialog.add_button(dlg, "Apply", Gtk.ResponseType.APPLY)