Use content-none.php instead of no-results.php

Renamed no-results.php to content-none.php for consistency (as done in core: https://core.trac.wordpress.org/ticket/25181); so let's make sure it's used.

search.php

@@ -27,7 +27,7 @@ get_header(); ?>
 
 		<?php else : ?>
 
-			<?php get_template_part( 'no-results', 'search' ); ?>
+			<?php get_template_part( 'content', 'none' ); ?>
 
 		<?php endif; ?>
 
@@ -35,4 +35,4 @@ get_header(); ?>
 	</section><!-- #primary -->
 
 <?php get_sidebar(); ?>
-<?php get_footer(); ?>
+<?php get_footer(); ?>