[web] Use hook instead of connect and HOC in LogInModal

Test Plan: Tested if the login modal still popped up and fuctioned normally

Reviewers: palys-swm, ashoat

Reviewed By: ashoat

Subscribers: ashoat, KatPo, zrebcu411, Adrian, atul, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D773