[Editor] Root assets from packages not transitive

[tebjan]

Release Type:
official

Version:
beta01-0406

Platform(s):
shared

Describe the bug
root assets of "external package" are not root assets of the game that references it.

To Reproduce

1. build a xenko package with root assets
2. reference this package in a game project so it appears under external packages

Expected behavior
root assets from an external package should become root assets of the game

Screenshots

Log and callstacks

Additional context
building a re-usable xenko nuget package

[tebjan]

great, thanks for the fix, will test asap.