MDL-46976 user: trim whitespace from input email address

Don't complain about invalid email address, we are a computer, we
love the jobs users hate.

ref: https://www.youtube.com/watch?v=5tquSbZEP-g

user/editlib.php

@@ -215,7 +215,7 @@ function useredit_shared_definition(&$mform, $editoroptions = null, $filemanager
     } else {
         $mform->addElement('text', 'email', get_string('email'), 'maxlength="100" size="30"');
         $mform->addRule('email', $strrequired, 'required', null, 'client');
-        $mform->setType('email', PARAM_EMAIL);
+        $mform->setType('email', PARAM_RAW_TRIMMED);
     }
 
     $choices = array();