Remove io.fabric.ApiKey override (#905)

Causes problems with Fabric SDK because it is present after manifest merger.

Author: Andrea Falcone

auth/src/main/AndroidManifest.xml

@@ -12,10 +12,6 @@
             android:name="com.google.android.gms.version"
             android:value="@integer/google_play_services_version" />
 
-        <meta-data
-            android:name="io.fabric.ApiKey"
-            android:value="@string/twitter_consumer_secret" />
-
         <meta-data
             android:name="com.facebook.sdk.ApplicationId"
             android:value="@string/facebook_application_id" />