Collections: Bring back simple visibility behaviour

If an object is in any visible collection, the object will be visible.
This behaviour has changed in 9ad2c0b615.

If it will change again, it will be for:
https://developer.blender.org/D2878

source/blender/blenkernel/intern/layer.c

@@ -1942,9 +1942,6 @@ void BKE_layer_eval_layer_collection(const struct EvaluationContext *UNUSED(eval
 			IDP_MergeGroup(base->collection_properties, layer_collection->properties_evaluated, true);
 			base->flag |= BASE_VISIBLED;
 		}
-		else {
-			base->flag &= ~BASE_VISIBLED;
-		}
 
 		if (is_selectable) {
 			base->flag |= BASE_SELECTABLED;