[native] Focus password field after autofilling username field (actually)
[native] Focus password field after autofilling username field (actually)

Summary: I screwed up in D93. This now matches [the logic](https://github.com/Ashoat/squadcal/blob/master/native/account/register-panel.react.js#L245-L257) in `RegisterPanel`.

Reviewers: palys-swm

Reviewed By: palys-swm

Subscribers: KatPo, zrebcu411, Adrian

Differential Revision: https://phabricator.ashoat.com/D103

Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal