Qualify this otherwise we get a ClassCastException when clearing the log...

Another small fix to the LogList : with java7 and recent versions of soapui, clearing the log panel (on a groovy script for example) gives me : 

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: com.eviware.soapui.support.log.JLogList$LogListModel$1 cannot be cast to javax.swing.ListModel
	at com.eviware.soapui.support.ListDataChangeListener.intervalRemoved(ListDataChangeListener.java:33)
	at javax.swing.AbstractListModel.fireIntervalRemoved(AbstractListModel.java:179)
	at com.eviware.soapui.support.log.JLogList$LogListModel.access$900(JLogList.java:383)
	at com.eviware.soapui.support.log.JLogList$LogListModel$1.run(JLogList.java:404)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)

This fixes that.