wayland/dnd-surface: Scale DnD-surface-actor content if necessary

Merged Robert Mader requested to merge rmader/mutter:dnd-fix into master

Since the recent clutter-content work, legacy scaling (in contrast to the new stage-view-scaling) only applies to surfaces that belong to a window. This broke scaling of DnD surfaces.

As a workaround, apply the same scaling on DnD-surface-actors until we use stage-view-scaling by default and can remove this again.

Fixes #685 (closed)

Edited by Robert Mader

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