Change item graphic - rennet

[Gauteamus]

It is a pain to make rennet - the old tea bug can be worked around in several ways, by dropping the filled jars or otherwise. The whole tea bug will probably (possibly) go away with the item quality overhaul, but it still feels buggy that the same graphics are used for empty jars and rennet filled ones. To put some pixels where my mouth is, I made a terrible suggestion of what a filled rennet jar might look like: