Messaging: provide adaptive icon

Change-Id: I81c3a823bfe6523cd75304adb6a5926d433645a2
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 8b4ef03..18a19ce 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -58,7 +58,7 @@
     <application
         android:name="com.android.messaging.BugleApplication"
         android:allowBackup="false"
-        android:icon="@drawable/ic_launcher"
+        android:icon="@mipmap/ic_launcher_messaging"
         android:label="@string/app_name"
         android:theme="@style/BugleTheme"
         android:supportsRtl="true">