Fix T77161: Outliner - Hiding a Collection does not gray out children objects

Ensure that When checking "Hide in Viewport" option for a collection
that child objects are drawn grayed out for consistency with the
"Disable in Viewports" toggle.

For checking an object visibility in the viewport the flag
BASE_VISIBLE_VIEWLAYER should be used instead of BASE_VISIBLE_DEPSGRAPH
because the latter ignores viewport visibility.

Manifest Task: T77161

Differential Revision: https://developer.blender.org/D7904

source/blender/editors/space_outliner/outliner_tree.c

@@ -1556,7 +1556,7 @@ static void outliner_add_layer_collection_objects(SpaceOutliner *space_outliner,
     TreeElement *te_object = outliner_add_element(space_outliner, tree, base->object, ten, 0, 0);
     te_object->directdata = base;
 
-    if (!(base->flag & BASE_VISIBLE_DEPSGRAPH)) {
+    if (!(base->flag & BASE_VISIBLE_VIEWLAYER)) {
       te_object->flag |= TE_DISABLED;
     }
   }