Update frame map unconditionally when starting scheduler.

Summary: This fix makes sure the captured frame map is properly updated when the Scheduler starts.

Test Plan:
Create a scheduler job with a sequence, make the sequence complete successfully.
Don't touch the Scheduler, remove some captures from the sequence storage.
Start the Scheduler.
Without this fix, capture count is not updated before starting the sequence.
With this fix, capture count is updated and transferred properly to the sequence.

Note that issues further down the pipe prevents the sequence from processing properly, this is a first step.

Reviewers: mutlaqja, wreissenberger

Reviewed By: mutlaqja

Subscribers: kde-edu

Tags: KDE Edu

Differential Revision: https://phabricator.kde.org/D14587