[web] Allow passing Modal parameters into SearchModal

Summary: Allow setting modal properties when using SearchModal. Will be used in following diffs.

Test Plan: All modals should work as before. Can be tested after next diff in stack.

Reviewers: palys-swm, benschac, atul

Reviewed By: palys-swm

Subscribers: ashoat, palys-swm, Adrian, atul, karol-bisztyga, benschac, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3670