Update PhoneStatusBar.java

Slight Correction: Didn't implement the halfwaydone check for the flip from notification to quick settings. This caused a slight flicker when you stopped swiping to quick settings, no major issue just a slight flicker when flipping. This addition removes that flicker.
circle battery

full credits go to CyanogenMod

Change-Id: Iaafd11133047791bab5f6155491a8acc57b31009