Unbounded upscaling of images doesn't work

When an image is smaller in size than the configured size, an option exists to make the image larger to fit. This option doesn't seem to work (anymore).

To reproduce:

• Using the console, set one of the properties named "upscale" to "true" in a subnode of:
  /hippo:configuration/hippo:frontend/cms/cms-services/galleryProcessorService
• set one of height or width to zero to activate the unbounded upscaling.
• Write changes
• Go to the CMS, and upload an image which is smaller than the configured size of the resulting image

Expected: The uploaded image is now bigger in the CMS than the original
Actual: The image size is unchanged