[evolution] Add refresh interval settings for CardDAV address books

[Milan Crha <mcrha src gnome org>]

commit 9d78c7f0cb7aca603d5f5fd8812a29e38d78142c
Author: Milan Crha <mcrha redhat com>
Date:   Tue Jul 16 15:21:00 2019 +0200

    Add refresh interval settings for CardDAV address books

 src/modules/book-config-carddav/evolution-book-config-carddav.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/modules/book-config-carddav/evolution-book-config-carddav.c 
b/src/modules/book-config-carddav/evolution-book-config-carddav.c
index 85ef417bc0..782c8334c1 100644
--- a/src/modules/book-config-carddav/evolution-book-config-carddav.c
+++ b/src/modules/book-config-carddav/evolution-book-config-carddav.c
@@ -302,6 +302,8 @@ book_config_carddav_insert_widgets (ESourceConfigBackend *backend,
        context->avoid_ifmatch = g_object_ref (widget);
        gtk_widget_show (widget);
 
+       e_source_config_add_refresh_interval (config, scratch_source);
+
        e_binding_bind_property (
                extension, "avoid-ifmatch",
                context->avoid_ifmatch, "active",