Use proper logging, more errors from tasks should now trigger showing the error dialog instead of siliently failing

lib/application_manager/tasks/repairer.rb

@@ -1,6 +1,8 @@
 class W3DHub
   class ApplicationManager
     class Repairer < Installer
+      LOG_TAG = "W3DHub::ApplicationManager::Repairer".freeze
+
       def type
         :repairer
       end