Fix visibility of VariableDateView

Missing setVisibility in animation atStart. That way we make sure that
it's always in a visible state before we start expanding. When in
keyguard, the expansion is 1 (GONE), but then it'd jump to 0 (missing
set to VISIBLE).

Test: manual
Fixes: 198797641
Change-Id: Ia7d22f37085779b9412ea35333bcdf4a664ef693

packages/SystemUI/src/com/android/systemui/qs/QuickStatusBarHeader.java

@@ -313,6 +313,7 @@ public class QuickStatusBarHeader extends FrameLayout {
                     public void onAnimationAtStart() {
                         super.onAnimationAtStart();
                         mClockDateView.setFreezeSwitching(false);
+                        mClockDateView.setVisibility(View.VISIBLE);
                         setSeparatorVisibility(mShowClockIconsSeparator);
                         // In QQS we never ignore RSSI.
                         mIconContainer.removeIgnoredSlots(mRssiIgnoredSlots);