MDL-86655 lib: Preserve native booleans in PARAM_BOOL cleaning

Return true/false for boolean inputs instead of 0/1, keeping strict
comparisons and schema validation correct.

Author: EliZard12

lib/classes/param.php

@@ -801,7 +801,10 @@ protected function clean_param_value_sequence(mixed $param): mixed {
      * @return mixed
      */
     protected function clean_param_value_bool(mixed $param): mixed {
-        // Convert to 1 or 0.
+        // Convert to 1 or 0 or bool.
+        if (is_bool($param)) {
+            return $param ? true : false;
+        }
         $tempstr = strtolower((string)$param);
         if ($tempstr === 'on' || $tempstr === 'yes' || $tempstr === 'true') {
             $param = 1;