Fix missing action chain schedule initial value

[Etheryte]

What does this PR change?

A regression in #7701 caused the initial value of the schedule picker not being set without interacting with the picker. This PR is a quick fix for it while I look into the underlying cause.

GUI diff

No difference.

• DONE

Documentation

• No documentation needed: only internal and user invisible changes

• DONE

Test coverage

• No tests: fixes Cucumber test

• DONE

Links

https://suse.slack.com/archives/C02DDMY6R0R/p1703001720936379
https://github.com/SUSE/spacewalk/issues/23243

• DONE

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[srbarrios]

Good to be merged, this will fix several tests failing for Uyuni

[srbarrios]

Related to https://github.com/SUSE/spacewalk/issues/23243