Repair using Typeahead Custom Fields in search interface
Summary:
Looks like rPfd9be992caed4ae1488dddd9bac33b8ea5d5c32e accidentally introduced a UI regression.
Co-authored by @mainframe98.
Closes T16328
Test Plan:
* In `/config/edit/maniphest.custom-field-definitions/`, define a field like `"train.backup": { "name": "Other Assignee", "edit": true, "view": true, "type": "users", "limit": 1, "copy": false, "fulltext": false, "search": true }`
* Go to http://phorge.localhost/maniphest/query/advanced/ and try to type in that field or click its magnifier button
* Go to http://phorge.localhost/typeahead/class/PhabricatorCustomFieldApplicationSearchDatasource/ and still get a 404 error as expected since D26131.
Reviewers: O1 Blessed Committers, mainframe98
Reviewed By: O1 Blessed Committers, mainframe98
Subscribers: mainframe98, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T16328
Differential Revision: https://we.phorge.it/D26480