denoiseprofile: disable highlight preservation if not applicable

The defaults now initialize the highlight preservation compensation
mode to FALSE if the image does not support it. While there is, at any
given point in time, no difference between setting it to FALSE and
setting it to TRUE if the image does not have applicable metadata,
we might break edits on "refresh EXIF" in future updates.

If a newer darktable version adds support e.g. for the Sony metadata,
edits which had been made before that would suddenly get a different
denoise profile selected.

By disabling the highlight compensation mode if the image was not shot
with highlight preservation (or at least we *think* it wasn't shot with
it), we avoid this.

Author: horazont

src/iop/denoiseprofile.c

@@ -2856,7 +2856,9 @@ void reload_defaults(dt_iop_module_t *self)
   d->fix_anscombe_and_nlmeans_norm = TRUE;
   d->use_new_vst = TRUE;
   d->wavelet_color_mode = MODE_Y0U0V0;
-  d->compensate_hilite_pres = TRUE;
+
+  const int iso_shift = _get_iso_highlight_preservation_shift(&self->dev->image_storage);
+  d->compensate_hilite_pres = iso_shift > 0;
 
   GList *profiles = dt_noiseprofile_get_matching(&self->dev->image_storage);
   char name[512];