Connection test URL should use site url, and not depend on the presence DOM elements

[matthewhilton]

The URL used to query the connection test:

moodle-mod_turnitintooltwo/jquery/turnitintooltwo_settings-2024100901.js

Lines 62 to 65 in eb903d0

	var url = "ajax.php";
	if ($('.settingsform fieldset div.formsettingheading').length > 0) {
	url = "../mod/turnitintooltwo/ajax.php";
	}

Currently it checks for the presence of a particular dom element to decide which URL to use. However, this is not ideal if your site has a custom theme where this DOM element does not exist because it will instead try to call /admin/ajax.php which does not exist.

It should really be using M.cfg.wwwroot instead