MDL-48570 course: Moved course search above course list.

Fixed regression from MDL-46295 'Course search box in course/index.php doesn't show when you navigate to the page.'

course/renderer.php

@@ -1749,12 +1749,12 @@ class core_course_renderer extends plugin_renderer_base {
             $catdisplayoptions['viewmoreurl'] = new moodle_url($baseurl, array('browse' => 'categories', 'page' => 1));
         }
         $chelper->set_courses_display_options($coursedisplayoptions)->set_categories_display_options($catdisplayoptions);
-        // Display course category tree.
-        $output .= $this->coursecat_tree($chelper, $coursecat);
-
         // Add course search form.
         $output .= $this->course_search_form();
 
+        // Display course category tree.
+        $output .= $this->coursecat_tree($chelper, $coursecat);
+
         // Add action buttons
         $output .= $this->container_start('buttons');
         $context = get_category_or_system_context($coursecat->id);