Unfortunately PR 7633 missed, and I didn't catch it during review, to update `test/driver.js` such that the `forms` tests takes the correct code-path.
This resultet in the `forms` reference test images looking better than they should, and more problematicly differing from the rendering in the viewer.
With this patch, the tests now correctly skip over any `Appearance` streams.
The `forms` tests now highlights quite clearly (e.g. look at `annotation-tx2.pdf`/`annotation-tx3.pdf`) that we cannot just skip the `Appearance` streams when rendering forms. Hence we're going to have to find a way to fix that *before* enabling forms by default, since both display *and* print would look completely wrong otherwise.
Finally, this patch also uncovers one more existing bug that still needs to be fixed, since the current `rasterizeAnnotationLayer` in `test/driver.js` isn't able to handle the contents of e.g. `<input>` and `<textarea>`.
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