Give the picker's id-lookup fixture the generated-name flag

[JeroenDeDauw]

#1357 reached master with a five-argument Subject constructor call after #1359 had added the sixth, so master's TypeScript CI and Docker image build fail on tests/components/common/SubjectPicker.spec.ts.

_{AI-authored — Claude Code, Fable 5.1 (max); found while resolving conflicts on #1345 for @JeroenDeDauw, no revisions; diff not yet human-reviewed; the picker spec (68 tests) passes locally with this line, and master's failing CI names exactly this call.}