Fixed PunkText's scaledWidth/Height mismatching accessor types (uint -> Number)

Fixed PunkText's scaledWidth() and scaledHeight() mismatching accessor types (Image uses Number, PunkText was using uint). This prevents compilation (AIR SDK 3.9.0.1030).

Screenshot: https://www.dropbox.com/s/jbz409etlywsp5x/Screenshot%202014-07-06%2023.55.45.png