Enable modernize_stripos option in modernize_strpos fixer

Author: paulbalandan

src/CodeIgniter4.php

@@ -245,7 +245,7 @@ public function __construct()
                 'attribute_placement'              => 'standalone',
             ],
             'method_chaining_indentation'            => true,
-            'modernize_strpos'                       => true,
+            'modernize_strpos'                       => ['modernize_stripos' => true],
             'modernize_types_casting'                => true,
             'multiline_comment_opening_closing'      => true,
             'multiline_string_to_heredoc'            => false,