recent regression in fitsdata

[Hy Murveit]

I noticed imaging tonight, something I haven't done for a bit, that the
fits statistics
aren't being computed for my captures. No HFR, no median, no
num-stars-in-image, ...

Without changing any parameters, I rad
  git checkout 66d10a8241b21f35ff5e95b999207835d7dce5a3
recompiled and ran, and all was well.

This seems to be the culprit

Thanks,
Hy

commit 66d10a8241b21f35ff5e95b999207835d7dce5a3
Author: Jasem Mutlaq <mutlaqja at ikarustech.com>
Date:   Thu Mar 11 02:41:06 2021 +0300

    When Adaptive Sampling is on, m_PreviewSampling is changed dynamically
depending on available memory. This MR fixes an issue whereas
m_PreviewSampling keeps increasing exponentially until it resets to zero
which then causes KStars to crash. This also fixes scaling issue when
dealing with large images with overlay since m_PreviewSampling can be
larger than 1.
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