Frameworks: take mPieScale into account to calculate estimated PIE width

if scaled size of the PIE is over or under the default size
the pie was either no using the whole screen space or
it was cutted off. To solve this take scale value
into account when calculating estimated width

greetings SlimRoms

Change-Id: Iccfc8362c0019e3b6ff4bd8066c313c67116c014