Issue backdrop-contrib#141: Fix PHP 8.1 issue on backtrace_error_hand…

…ler()

By @yorkshire-pudding and @alanmels.

devel.module

@@ -587,7 +587,7 @@ function devel_boot() {
  *   An array that points to the active symbol table at the point the error
  *   occurred.
  */
-function backtrace_error_handler($error_level, $message, $filename, $line, $context) {
+function backtrace_error_handler($error_level, $message, $filename, $line, $context = NULL) {
   // Hide stack trace and parameters from unqualified users.
   if (!user_access('access devel information')) {
     // Do what core does in bootstrap.inc and errors.inc.