Don't use arbitrary theme editor icons for scripts with the same name

The existing theme editor icon could be unintentionally set for any
global class with matching name (`Group` icon, `Group` class_name etc),
which would only show up in the "Create Dialog" context, but not the
scene tree dock.

This change prevents this behavior, and ensures that the icon can be
actually overidden by explicit icon path in `class_name`, if there's any
custom icon to begin with.

The correct built-in type's icon is fetched for child classes if there
are no custom icons detected throughout base classes as well, so it
isn't left empty for those cases.

0 files changed, 0 insertions, 0 deletions