Remove double greyed-out-overlay
Remove double greyed-out-overlay

Summary:
When a toggled section is frozen, it already has a greyed out overlay over the whole thing.
So there's no need for another one covering the indented section.

Reviewed By: passy

Differential Revision: D18063767

fbshipit-source-id: a4d5992ecf61f036a23f619e9cf64d59150a41d6

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