[Bf-viewport] Eevee sample files need manual fix

[Dalai Felinto]

Dear testers and developers,

Due to technical reasons if you had any Eevee test file prior to today
you will need to manually fix the file.

Go over all the materials, add a new Material Output node and connect
it to the Metallic/Specular nodes you originally created.

Optionally you can just run this script in the Text Editor:
http://pasteall.org/443791/python

Regards,
Dalai
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