Fix vulnerability in handling _session argument of utils/save-prefs (#1489382)

Aleksander Machniak

2013-10-17 037af6890fe6fdb84a08d3c86083e847c90ec0ad

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<roundcube:object name="logo" src="/images/roundcube_logo.png" id="logo" border="0" onclick="location.href='./?_page=1'" />
<roundcube:object name="message" id="message" />