Blender Git Loki

Fix T78469: Output Metadata: Strip Name no longer accessible

Caused by rB7fc60bff14a6.

This has actually been reported and closed, but that was clearly a
misunderstanding (above commit changed a checkbox to be an enum, but a
second checkbox was simply removed)

Maniphest Tasks: T78469

Differential Revision: https://developer.blender.org/D12084