[shotwell] Remove some dead code

[Jens Georg <jensgeorg src gnome org>]

commit 1f2419796f1d6d880edfa2ff7735f2fe38dabad8
Author: Jens Georg <mail jensge org>
Date:   Wed Feb 19 21:31:21 2020 +0100

    Remove some dead code

 src/sidebar/Tree.vala | 11 -----------
 1 file changed, 11 deletions(-)
---
diff --git a/src/sidebar/Tree.vala b/src/sidebar/Tree.vala
index 0750d778..aae81a01 100644
--- a/src/sidebar/Tree.vala
+++ b/src/sidebar/Tree.vala
@@ -789,17 +789,6 @@ public class Sidebar.Tree : Gtk.TreeView {
         store.set(iter, Columns.ICON, icon);
     }
     
-    private void load_branch_icons(Gtk.TreeIter iter) {
-        load_entry_icons(iter);
-        
-        Gtk.TreeIter child_iter;
-        if (store.iter_children(out child_iter, iter)) {
-            do {
-                load_branch_icons(child_iter);
-            } while (store.iter_next(ref child_iter));
-        }
-    }
-    
     private bool on_selection(Gtk.TreeSelection selection, Gtk.TreeModel model, Gtk.TreePath path,
         bool path_currently_selected) {
         // only allow selection if a page is selectable