MDL-75234 mod_data: Remove duplicate code

* Remove duplicate use statements
* Remove duplicate get_template_content() declaration

mod/data/classes/manager.php

@@ -26,8 +26,6 @@ use mod_data\event\template_viewed;
 use mod_data\event\template_updated;
 use moodle_page;
 use core_component;
-use mod_data_renderer;
-use moodle_page;
 use stdClass;
 
 /**

mod/data/classes/template.php

@@ -231,15 +231,6 @@ class template {
         ];
     }
 
-    /**
-     * Return the raw template content.
-     *
-     * @return string the template content before parsing
-     */
-    public function get_template_content(): string {
-        return $this->templatecontent;
-    }
-
     /**
      * Return the parsed entry using a template.
      *