do not check 'remember' log in by default

core/templates/login.php

@@ -45,7 +45,7 @@
 		</a>
 		<?php endif; ?>
 		<?php if ($_['rememberLoginAllowed'] === true) : ?>
-		<input type="checkbox" name="remember_login" value="1" id="remember_login" checked />
+		<input type="checkbox" name="remember_login" value="1" id="remember_login" />
 		<label for="remember_login"><?php p($l->t('remember')); ?></label>
 		<?php endif; ?>
 		<input type="hidden" name="timezone-offset" id="timezone-offset"/>