Set list_item_pinned_header_color based on config

Bug: 17321600
Change-Id: Ib786975b2d4d961cf19b0b523459ba2efce0067a
diff --git a/res/values/colors.xml b/res/values/colors.xml
index 6cd9c14..985a4e5 100644
--- a/res/values/colors.xml
+++ b/res/values/colors.xml
@@ -53,5 +53,5 @@
     <color name="call_arrow_red">#ff2e58</color>
 
     <!-- Background color of pinned header items. -->
-    <color name="list_item_pinned_header_color">#f5f5f5</color>
+    <color name="list_item_pinned_header_color">@color/background_primary</color>
 </resources>