ExtendedLeavesBlock is not supported in leaf decay

[coderbot16]

ExtendedLeavesBlock, used by Redwood and Hemlock leaves in Terrestria, doesn't subclass LeavesBlock because it uses a distance property that supports leaves being farther from trees than vanilla. Not extending LeavesBlock actually prevents a crash here because otherwise mods like this would have tried to retrieve the DISTANCE property which isn't present on redwood and hemlock leaves.

I think that there's a few things that could be done to fix this:

• Use BlockTags.LEAVES instead of instanceof LeavesBlock
• Instead of accessing the DISTANCE property, use hasRandomTicks to detect whether the leaf block can decay and randomTick to cause the leaf block to decay

While doing that could be a bit hacky, it also nicely supports both vanilla leaves and ExtendedLeavesBlock from Terraform.