wrong layer.bounds with double nested components

If a layer uses a double-nested component, the origin x and y of the bounds returned are incorrect.
Here is a test file : [wrong_layer_bounds_with_nested_component.glyphs.zip](https://github.com/user-attachments/files/18008941/wrong_layer_bounds_with_nested_component.glyphs.zip)

`quotedblright` is made with `quotedblleft` himsel made with two `comma`

From GlyphsApp
```
size=>
```

from glyphLib
```
size=>
```

Start with the attached wrong_layer_bounds_with_nested_component.glyphs.zip file and reproduce the bounds discrepancy described for quotedblright, quotedblleft, and comma. Compare glyphLib's returned origin and size with the GlyphsApp values; done means the double-nested component produces matching bounds.

Written by the indexing model from the issue text.