[#737] Proper fix ImageLayer ratio *and* position
[#737] Proper fix ImageLayer ratio *and* position

- Seems the Wolfram Alpha optimization applied the ratio on the wrong side.
- This fixes the scrolling and positioning, according to further tests.

rlugojr/melonJS,srbala/melonJS,rlugojr/melonJS,srbala/melonJS,srbala/melonJS,melonjs/melonJS,melonjs/melonJS,rlugojr/melonJS