Switch to 300 dpi resolution

[pudo]

To make tesseract happy.

[sunu]

96ccdcc doesn't really fix the issue. 72 is hard coded in a bunch of places inside the poppler codebase unfortunately. Will have to dig into it a bit more.

[pudo]

In that case, I wouldn't bother too much. They probably have their reasons (TM) and we can still get good OCR results out of it.