fix kompot in jar: gives 12 charges, just like crafting kompot directly,

Fixes #3160 - issue 3596 (mentioned in the comments) is already closed.

After activation of the sealed jar, it transforms into a standard jar and the contents are available. Unloading the contents gives the expected (and already shown) 12 units of kompot.

The max_charges/initial_charges have been changed to the values the other canned foods have.