Quick Settings: Avoid expand indicators shortly showing on edit

* Upon entering of the Quick Settings edit view, during
    the animation, all the expand indicators are rarely
    visible for a short period of time until hidden

 * To avoid this visual glitch, hide the expand_indicator
    by default and let the code show it when necessary
    instead of hiding it for most cases

Change-Id: Ia14d9a8d63178ccb54fbcb969ddf51f06c88f35c
Signed-off-by: Adrian DC <radian.dc@gmail.com>

packages/SystemUI/res/layout/qs_tile_label.xml

@@ -63,7 +63,8 @@
             android:layout_width="18dp"
             android:layout_height="match_parent"
             android:src="@drawable/qs_dual_tile_caret"
-            android:tint="?android:attr/textColorPrimary" />
+            android:tint="?android:attr/textColorPrimary"
+            android:visibility="gone" />
     </LinearLayout>
 
     <TextView