Enable end to end deltas by default on Android

Reviewed By: mjesun

Differential Revision: D6374111

fbshipit-source-id: f372242ddbb8a278041d1ebb2aace227a571c2e0

Author: rafeca

ReactAndroid/src/main/res/devsupport/xml/preferences.xml

@@ -23,7 +23,7 @@
       android:key="js_bundle_deltas"
       android:title="Use JS Deltas"
       android:summary="Request delta bundles from metro to get faster reloads (Experimental)"
-      android:defaultValue="false"
+      android:defaultValue="true"
       />
     <CheckBoxPreference
         android:key="animations_debug"