[web] Rearrange selectedThreadColorsObj in thread-utils

Summary: Change the order of colors in thread-utils to match the order that we want in the ColorSelector component.

Test Plan: Looks as expected.

Reviewers: palys-swm, def-au1t, ashoat

Reviewed By: ashoat

Subscribers: ashoat, Adrian, karol-bisztyga, benschac, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3682