Regression: Large images are cut off on PDF Export

The original thread: https://jira.atlassian.com/browse/CONF-33727

A large image is just cutted in width on a PDF export instead of being resized.

Steps to reproduce:

1. Create a new page;
2. Include an image (I am attaching the one I used in the test, adding borders in order to better notice the cut);
3. Save the page;
4. Export as PDF;
5. Notice the right part is cut.