Updating a look where the shader name changed leaves the geo without a shader

[mkolar]

Describe the bug
Updating a look to latest version using scene inventory GUI leaves the geo without a shader, in cases where a name of the shader changed between the version. Even though the renamed shader has all correct id assignments.

To Reproduce
Steps to reproduce the behavior:

1. Publish a look for a model
2. Load the look onto a model in a different scene (setdress for example) using look manager
3. In the lookdev scene, change the name of one of the shaders and publish another version
4. In the "setdress" scene open scene inventory and update the look to latest version
5. The object that has the renamed look applied to it, ends up without any shader.

Expected behavior
Look updating should work the same as all other families from the scene inventory. That means that we'll need to duplicate some of the logic from look assigned to the update method of the look loader

[create-issue-branch]

Branch bugfix/237-Updating_a_look_where_the_shader_name_changed_leaves_the_geo_without_a_shader created!