[gnome-control-center] applications: Fix flatpak ID memory leak

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 29eebceddde53aee338cba99faf0d5a8c94d131a
Author: Robert Ancell <robert ancell canonical com>
Date:   Mon Mar 18 16:06:05 2019 +1300

    applications: Fix flatpak ID memory leak

 panels/applications/cc-applications-panel.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/panels/applications/cc-applications-panel.c b/panels/applications/cc-applications-panel.c
index b4aae5838..2d5ec1a00 100644
--- a/panels/applications/cc-applications-panel.c
+++ b/panels/applications/cc-applications-panel.c
@@ -1497,6 +1497,7 @@ cc_applications_panel_finalize (GObject *object)
   g_clear_object (&self->cancellable);
 
   g_free (self->current_app_id);
+  g_free (self->current_flatpak_id);
   g_hash_table_unref (self->globs);
   g_hash_table_unref (self->search_providers);