Change InCallUI colors to teal.

Also, reformatted call_button_fragment to make it cleaner.

Bug: 14108639
Change-Id: Iab86f9854a32c0dc11956b1cbd082652fac1ef4b
diff --git a/InCallUI/res/values/styles.xml b/InCallUI/res/values/styles.xml
index 3fb2bb2..085cdb1 100644
--- a/InCallUI/res/values/styles.xml
+++ b/InCallUI/res/values/styles.xml
@@ -71,7 +71,7 @@
     <style name="VerticalSeparator">
         <item name="android:layout_width">2dp</item>
         <item name="android:layout_height">match_parent</item>
-        <item name="android:background">@android:color/black</item>
+        <item name="android:background">@color/button_background_color</item>
     </style>
 
     <!-- "End" button; similar to InCallButton. -->