Volume: Use teal color for "End now".

Bug: 20888718
Change-Id: I7f485dd5faa42ec7c2631c7bdeb3c03ddb46c530
diff --git a/packages/SystemUI/res/layout/volume_zen_footer.xml b/packages/SystemUI/res/layout/volume_zen_footer.xml
index 9e761e2..b780f7d 100644
--- a/packages/SystemUI/res/layout/volume_zen_footer.xml
+++ b/packages/SystemUI/res/layout/volume_zen_footer.xml
@@ -72,6 +72,7 @@
             android:focusable="true"
             android:minWidth="91dp"
             android:text="@string/volume_zen_end_now"
+            android:textColor="@color/system_accent_color"
             android:textAppearance="@style/TextAppearance.QS.DetailButton" />
     </LinearLayout>