[native] Adjust message target position when author name is displayed in tooltip
[native] Adjust message target position when author name is displayed in tooltip

Summary: We need to include an additional offset when an author name is displayed.

Test Plan: Test message animation when a source message wasn't created by a viewer.

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: Adrian, atul, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D1818

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