Remove useless/repetitive code

fixScale(float) method has been extracted from the code but the original
code has been kept in place. Because of this, the animation scale is
"fixed" twice which is not necessary. This patch, simply call
fixScale(float) once and stores the result of it in the scale variable.

Change-Id: I50aeacbc2c13ebbf447506ae4309d50c0e313837
Consider mScrollX when drawing the checkMarkDrawable

When mScrollX has a very large value the checkmark will not show,
unless it is considered when setting the bounds of the drawable.

Change-Id: Ic4c9bce950816686622baa7330ebb2e69ecfb8e6