Default to device backup/restore vs. adb backup/restore

Change-Id: I81bfea1e9978dd003e96a48f399d259a878ddc44

data.cpp

@@ -848,6 +848,8 @@ void DataManager::SetDefaultValues()
 	mData.SetValue("tw_app_install_status", "0"); // 0 = no status, 1 = not installed, 2 = already installed
 #endif
 
+        mData.SetValue("tw_enable_adb_backup", "0");
+
 	pthread_mutex_unlock(&m_valuesLock);
 }