Revert "Change launcher icons to MaskableIconDrawable Test: manual test"

This reverts commit a8bd6c1bb8a1f1d7d7d589b2c9339f8201522405.

Change-Id: Iad92e544854776dcb9c4d7d3feeb2ac1b2a411d9
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 693d3a6..0de7a4e 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -83,7 +83,7 @@
     <uses-permission android:name="android.permission.DELETE_PACKAGES"/>
 
     <application android:label="@string/settings_label"
-            android:icon="@drawable/ic_launcher_settings"
+            android:icon="@mipmap/ic_launcher_settings"
             android:taskAffinity=""
             android:theme="@style/Theme.Settings"
             android:hardwareAccelerated="true"