plugins/zoom: Fix zoom on rotated outputs

Vlad Zahorodniirequested to merge
work/zzag/plugins-zoom-rotated-screen into master

Amends 8548b5fd.

The offscreen texture used to have the same transform as the onscreen texture. With output mirroring patches, it is no longer the case, so make sure that the content transform is reset.

This fixes the content on zoomed in rotated screens being cropped.

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