Replace voicemail seekbar playback asset

Bug: 15935940
Change-Id: Icdbd06ea882e59fdca25d13e63557efacf14451c
diff --git a/res/layout/playback_layout.xml b/res/layout/playback_layout.xml
index 500ed96..54d0c59 100644
--- a/res/layout/playback_layout.xml
+++ b/res/layout/playback_layout.xml
@@ -64,7 +64,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:progressDrawable="@drawable/seekbar_drawable"
-            android:thumb="@drawable/seek_bar_thumb"
+            android:thumb="@drawable/ic_voicemail_seek_handle"
             android:thumbOffset="8dip"
             android:progress="0"
             android:paddingStart="8dip"