Minor but important bug in packetfilter rule-edit-form.jsp

In file rule-edit-form.jsp for packetfilter plugin.

There is a minor bug: at line 171:

if (destJID == null || !(sourceJID.length() > 0)) {

this should actually be

if (destJID == null || !(destJID.length() > 0)) {

so please fix it.