Fix layout of summary submenu

With this change, the buttons are now properly left-aligned with the
main div, instead of being slightly offset to the left, which is
particularly visible on narrow screens.

Fixes #25385

core/html_api.php

@@ -585,15 +585,14 @@ function print_summary_submenu() {
 
 	if( count($t_menu_options) > 0 ) {
 		echo '<div class="space-10"></div>';
-		echo '<div class="center">';
-		echo '<div class="btn-toolbar inline">';
+		echo '<div class="col-md-12 col-xs-12 center">';
 		echo '<div class="btn-group">';
 
 		# Plugins menu items - these are cooked links
 		foreach ($t_menu_options as $t_menu_item) {
 			echo $t_menu_item;
 		}
-		echo '</div></div></div>';
+		echo '</div></div>';
 	}
 }