[web] use getNextLocalUploadID in web/inputStateContainer
Summary: Addressing https://phabricator.ashoat.com/D947#22346
Test Plan: careful reading
Reviewers: ashoat, palys-swm
Reviewed By: ashoat
Subscribers: KatPo, zrebcu411, Adrian, subnub
Differential Revision: https://phabricator.ashoat.com/D951