Change GtkDialog use-header-bar property to G_PARAM_CONSTRUCT
This commit changes the "use-header-bar" property from G_PARAM_CONSTRUCT_ONLY to G_PARAM_CONSTRUCT to allow for setting from template builder files
Fixes #3564
This commit changes the "use-header-bar" property from G_PARAM_CONSTRUCT_ONLY to G_PARAM_CONSTRUCT to allow for setting from template builder files
Fixes #3564