Verify 'Full Name' field does not allow HTML.

'Full Name' field in the student account settings is allowing HTML
as an input which makes spoofing easily.To avoid it, validation is
added that ensures 'Full Name' field does not allow HTML as input.

LEARNER-3337

common/test/acceptance/tests/lms/test_account_settings.py

@@ -275,16 +275,9 @@ class AccountSettingsPageTest(AccountSettingsTestMixin, AcceptanceTest):
             u'Full Name',
             self.full_name,
             u'@',
-            [u'another name', self.full_name],
-        )
-
-        actual_events = self.wait_for_events(event_filter=self.settings_changed_event_filter, number_of_matches=2)
-        self.assert_events_match(
-            [
-                self.expected_settings_changed_event('name', self.full_name, 'another name'),
-                self.expected_settings_changed_event('name', 'another name', self.full_name),
-            ],
-            actual_events
+            [u'<h1>another name<h1>', self.full_name],
+            u'Full Name cannot contain the following characters: < >',
+            False
         )
 
     def test_email_field(self):