Use 4 spaces to indent PHP files.

Signed-off-by: RD WebDesign <github@rdwebdesign.com.br>

groups.php

@@ -1,11 +1,14 @@
-<?php /*
+<?php
+/*
 *    Pi-hole: A black hole for Internet advertisements
 *    (c) 2019 Pi-hole, LLC (https://pi-hole.net)
 *    Network-wide ad blocking via your own hardware.
 *
 *    This file is copyright under the latest version of the EUPL.
-*    Please see LICENSE file for your rights under this license. */
-    require "scripts/pi-hole/php/header.php";
+*    Please see LICENSE file for your rights under this license.
+*/
+
+require "scripts/pi-hole/php/header.php";
 ?>
 
 <!-- Title -->
@@ -59,14 +62,14 @@
             <div class="box-body">
                 <table id="groupsTable" class="table table-striped table-bordered" width="100%">
                     <thead>
-                    <tr>
-                        <th>ID</th>
-                        <th></th>
-                        <th>Name</th>
-                        <th>Status</th>
-                        <th>Description</th>
-                        <th>&nbsp;</th>
-                    </tr>
+                        <tr>
+                            <th>ID</th>
+                            <th></th>
+                            <th>Name</th>
+                            <th>Status</th>
+                            <th>Description</th>
+                            <th>&nbsp;</th>
+                        </tr>
                     </thead>
                 </table>
                 <button type="button" id="resetButton" class="btn btn-default btn-sm text-red hidden">Reset sorting</button>