MDL-84905 Behat: Fix I set the following administration settings failure

admin/tests/behat/behat_admin.php

@@ -82,6 +82,8 @@ class behat_admin extends behat_base {
 
             $this->execute('behat_forms::i_set_the_field_with_xpath_to', [$fieldxpath, $value]);
             $this->execute("behat_general::i_click_on", [get_string('savechanges'), 'button']);
+            // Wait for the page to be redirected.
+            $this->execute("behat_general::i_wait_to_be_redirected");
         }
     }
 

theme/classic/tests/behat/behat_theme_classic_behat_admin.php

@@ -89,8 +89,9 @@ class behat_theme_classic_behat_admin extends behat_admin {
             }
 
             $this->execute('behat_forms::i_set_the_field_with_xpath_to', [$fieldxpath, $value]);
-
             $this->execute("behat_general::i_click_on", [get_string('savechanges'), 'button']);
+            // Wait for the page to be redirected.
+            $this->execute("behat_general::i_wait_to_be_redirected");
         }
     }
 }