Bugfix for focus looping with HFR setup

Summary: When using HFR limits to trigger focusing after a certain amount of frames, the Capture module runs into an endless loop if "In-Sequence HFR Check" is set to "1". This patch corrects it.

Test Plan:
Start KStars with simulators:

• Start an autofocus sequence so that autofocus succeeds.
• Create an image sequence with HFR limit set and with more than one frame. Set EKOS / Capture Parameter "In-Sequence HFR Check" to 1.
• Start the image sequence

Without this patch, the Capture module runs into an endless loop executing a re-focus, as soon as the first image has been captured.

Reviewers: mutlaqja, TallFurryMan

Reviewed By: mutlaqja

Subscribers: kde-edu

Tags: KDE Edu

Differential Revision: https://phabricator.kde.org/D23258