user/policy: MDL-23812 set PAGE context and appropriately use moodle_…

…url for button

Thanks to Myles Carrick for the patch!

user/policy.php

@@ -62,6 +62,7 @@
 $strpolicyagreement = get_string('policyagreement');
 $strpolicyagreementclick = get_string('policyagreementclick');
 
+$PAGE->set_context(get_context_instance(CONTEXT_SYSTEM));
 $PAGE->set_title($strpolicyagreement);
 $PAGE->set_heading($SITE->fullname);
 $PAGE->navbar->add($strpolicyagreement);
@@ -82,7 +83,7 @@
 echo '</object></div>';
 
 $formcontinue = new single_button(new moodle_url('policy.php', array('agree'=>1)), get_string('yes'));
-$formcancel = new single_button($CFG->wwwroot.'/login/logout.php', get_string('no'));
+$formcancel = new single_button(new moodle_url($CFG->wwwroot.'/login/logout.php', array('agree'=>0)), get_string('no'));
 echo $OUTPUT->confirm($strpolicyagree, $formcontinue, $formcancel);
 
 echo $OUTPUT->footer();