Bug in `CompoundTag.partOf()`

[arvitus]

There is a bug in the CompoundTag.partOf() method that leads to inaccurate results. Because of this, it might happen that this methods returns True, even if not all of the child tags of the other Compound are also in the original Compound.

This is because of this line and can be easyily fixed by only return from this line, if the result is False.

So return tag.equals(other.get(entry.getKey())); becomes if (!tag.equals(other.get(entry.getKey()))) return false;, and that's it.

I discovered this, because a Script I wrote for MCA did not work as intended. So this fix should also be included in MCA.

[arvitus]

I referenced the nbt7 branch, but it also applies to nbt8-test