Update template screenshots

[MAILPOET-1558]

lib/Config/PopulatorData/Templates/ModularStyleStories.php

@@ -23,7 +23,7 @@ class ModularStyleStories {
   }
 
   private function getThumbnail() {
-    return $this->template_image_url . '/modular-style-stories.jpg';
+    return $this->template_image_url . '/modular-style-stories-1558.jpg';
   }
 
   private function getBody() {

lib/Config/PopulatorData/Templates/NotSoMedium.php

@@ -23,7 +23,7 @@ class NotSoMedium {
   }
 
   private function getThumbnail() {
-    return $this->template_image_url . '/not-so-medium.jpg';
+    return $this->template_image_url . '/not-so-medium-1558.jpg';
   }
 
   private function getBody() {

lib/Config/PopulatorData/Templates/RssSimpleNews.php

@@ -23,7 +23,7 @@ class RssSimpleNews {
   }
 
   private function getThumbnail() {
-    return $this->template_image_url . '/rss-simple-news.jpg';
+    return $this->template_image_url . '/rss-simple-news-1558.jpg';
   }
 
   private function getBody() {

lib/Config/PopulatorData/Templates/ScienceWeekly.php

@@ -1188,7 +1188,7 @@ class ScienceWeekly {
   }
 
   private function getThumbnail() {
-    return $this->template_image_url . '/science-weekly-new.jpg';
+    return $this->template_image_url . '/science-weekly-1558.jpg';
   }
 
 }

lib/Config/PopulatorData/Templates/WideStoryLayout.php

@@ -23,7 +23,7 @@ class WideStoryLayout {
   }
 
   private function getThumbnail() {
-    return $this->template_image_url . '/wide-story-layout.jpg';
+    return $this->template_image_url . '/wide-story-layout-1558.jpg';
   }
 
   private function getBody() {