Fix reloading of tools with liquids.

The previous code would only consider containers if the ammo type is gasoline. No it considers all contents of all containers.

Tested with shotgun + rail-mounted crossbow + aux flamethrower and oil lamp + oil in main inventory without container + oil in container.

Works if the ammo is wielded, too.

Reported here: http://www.bay12forums.com/smf/index.php?topic=121194.msg5090405#msg5090405