This commit makes enchanted tools which have no use for
tool_capabilities to not include it in their metadata. It does this by
not including tool_capabilities in the metadata of an enchanted tool if
at least one of two cases is true:
(1) The tool is not enchanted with unbreaking or efficiency
(2) The tool does not have tool_capabilities defined in its definition
The first case covers situations like having a pickaxe only being
enchanted with silk_touch. The second case covers situations like a
piece of armor being enchanted with unbreaking.
This commit fixes an issue were tools enchanted with both efficiency and
unbreaking would loose the effect of one of the enchantments in some
conditions.
