Modify the scene only when color changed
Modify the scene only when color changed

Editor now changes a color in the inspector only when it is different
from the current one.

Solves fake unsaved changes in editor after using the ColorPicker.

Resolves: #40879
(cherry picked from commit f3626364fc97c6b0d4692d5e8d5c5f3aeddc3f17)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot