[native] Use hook instead of connect function in ColorPicker

Test Plan: Checked if the color picker still popped up and that threads colors could still be changed

Reviewers: palys-swm, ashoat, atul

Reviewed By: ashoat

Subscribers: ashoat, KatPo, zrebcu411, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D833