wmail: fixed use-after-free.

The CleanupNames() function removed the sender-addresses for deleted
mails, but did not set the namesChanged flag to true.  This meant that
if the ticker was displaying the address of a mail which had been
deleted it would continue doing so after the address had been freed.

wmail/src/wmail.c

@@ -1730,6 +1730,8 @@ static void CleanupNames( void )
 
 	    free( name->name );
 	    free( name );
+
+	    namesChanged = true;
 	}
 	else
 	{