Redraw minute hand when paint is updated.

Bug: 123029363
Test: Minute hand color switches between AOD and lock screen.
Change-Id: I7fde1eb1220fb0f049b57742446b093864852532

packages/SystemUI/src/com/android/keyguard/clock/StretchAnalogClock.java

@@ -80,6 +80,7 @@ public class StretchAnalogClock extends View {
      */
     public void setMinuteHandColor(int color) {
         mMinutePaint.setColor(color);
+        invalidate();
     }
 
     private void init() {