Revert "Target Contacts to N SDK."

This reverts commit f5f31dc027d67782e370757e4ba8d60200ccbf43.

Bug 28054614
Bug 27854413

Change-Id: I22af3e38049e5e4f56ffb9991aa5435fbc8dbc4e
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 2eb1b9d..6152b59 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -19,7 +19,7 @@
     android:versionCode="10408"
     android:versionName="1.4.8">
 
-    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="24" />
+    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="23" />
     <original-package android:name="com.android.contacts" />
 
     <uses-permission android:name="android.permission.CALL_PHONE" />