Fix touch screen on Canvas and popLayer method.

[kynora]

• Touch screen coordinate on mobile device not correct when in portrait mode.
• Canvas.popLayer(); pop the last dialogs, not work with specific layer.

[greenfire27]

You're basically switching back to the old code that was written before mobile devices were added. The functions that you're switching between are very similar except for a few bug fixes. If you switch back you might be fixing your problem but you are also reviving other bugs. It would be better to figure out a way to fix the new functions instead of just reverting back to the old ones.