Replace scaled bird's eye image with unscaled one

Loads and scales up the thumbnail image for the bird's eye view
in the first place (fast) - like it was before, but then requests
the image again with the right dimensions (might be slow, but
better quality).
Just added a space
Merge pull request #2761 from dominikl/rebased/dev_5_0/birdeye_pixellation

Avoid upscaling of bird's eye image (rebased onto dev_5_0)