[native] Minor `ThreadAncesters` tweaks
[native] Minor `ThreadAncesters` tweaks

Summary:
- Move `paddingHorizontal` from `container` to `contentContainer`
- Hide horizontal scroll indicator

Test Plan: Looks and works as expected

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: KatPo, palys-swm, Adrian

Differential Revision: https://phabricator.ashoat.com/D1391

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