Set repository_file_tree_browser to default:true

Chaoyue Zhaorequested to merge
set-ftb-default-true into master

What does this MR do and why?

Set repository_file_tree_browser to default:true

Changelog: changed

References

Last step of [FF] Rollout `repository_file_tree_browser` (#537970 - closed)

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Resolves #537970 (closed)

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