Remove the poll on plugin deactivation

Remove the poll asking for deactivation reasons as we are no longer using the data.

[MAILPOET-3705]

lib/Config/Initializer.php

@@ -229,7 +229,6 @@ class Initializer {
       $this->setupPages();
 
       $this->setupPermanentNotices();
-      $this->setupDeactivationSurvey();
       $this->setupAutomaticEmails();
       $this->postEditorBlock->init();
 
@@ -362,11 +361,6 @@ class Initializer {
     return WPNotice::displayWarning($exception->getMessage());
   }
 
-  public function setupDeactivationSurvey() {
-    $survey = new DeactivationSurvey($this->renderer);
-    $survey->init();
-  }
-
   public function setupAutomaticEmails() {
     $automaticEmails = new AutomaticEmails();
     $automaticEmails->init();