Add the option to fix the Oblique to 0 with auto deskew

[riparise]

Thanks for the amazing app.

I would be nice to have an option in the deskew step to only rotate, but not apply the oblique transformation (e.g. scanned images).

[jrsrjrsr]

Agree with both statements made by @riparise.

I have been using the updated version to process scanned drawings for which the automatic oblique algorithm, for whatever reason, is more often detrimental and less often helpful. But, unlike most other transformations in the app, there is no way to tell it not to apply the transformation automatically. If someone gets interested in implementing this, than perhaps a similar Automatic versus Manual choice here as with other options would be helpful.