Move over the default logo asset.

Change-Id: I2bbab279c4833d03db741f8ec2ebba3566ac58a4
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index e86cd30..a57d8cf 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -4,7 +4,7 @@
       android:versionCode="1"
       android:versionName="1.0">
 
-    <application android:icon="@drawable/icon"
+    <application android:icon="@mipmap/ic_launcher_mail"
         android:label="@string/app_name">
         <activity android:name=".UnifiedEmail"
                   android:label="@string/app_name"