Blender Git Loki

Fix eternal compo refresh when having image editor with mask opened

This was a regression since 55719 and the reason is:

- image_refresh() will tag combo for re-calc when editing mask.
This is a feature, so you could have immediate feedback on masking
and compositing while editing mask. This is done from image_refresh().

- Color management sends NC_WINDOW notifier, so the whole window is
updated when changing color management settings. Image editor used
to refresh space when this notifier is sent.

The same notifier is sent by compositor job to redraw all possible
viewers.

Simple fix: don't refresh image space for NC_WINDOW, there's nothing
in image_refresh() which we would want to happen on NC_WINDOW event.