Revert "Slider: Fix "Binding loop detected" warning"
Revert "Slider: Fix "Binding loop detected" warning"

This reverts commit 1283dffcae90ace0cd97e10f28082318a3049271

As Tomasz pointed out, this causes a regression when setting value so we need to revise.

Change-Id: I965b815b14b7ec7497e1a09d42fd973c74759f2b
Reviewed-by: Caroline Chao <cb6a0059f4e516e853a34cb558c25ca5a9bcf4ab@digia.com>

drgvond/qtquickcontrols,mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,drgvond/qtquickcontrols,kobolabs/qtquickcontrols,mizukusak/qtquickcontrols,mizukusak/qtquickcontrols,drgvond/qtquickcontrols,kobolabs/qtquickcontrols