Fix loading bar positioning.

Move it down and make sure it covers entire width.

Change-Id: If906ea86ae1e78b7a75e2376c65f0ff0e191b86c
Fixes: 30292983
Test: Manual visual inspection of UI element locations

packages/SystemUI/res/layout/qs_detail.xml

@@ -42,6 +42,8 @@
         android:background="@color/qs_detail_progress_track"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:scaleType="fitXY"
+        android:translationY="8dp"
         />
 
     <com.android.systemui.qs.NonInterceptingScrollView