WORLDGUARD-3451 - Reported by andrewkm

We are currently blacklisting on-interact on item 52 (spawners) to prevent users changing spawner types.
However, this causes spawners to not be breakable what so ever. (Using pickaxe to test)

Removing the on-interact block fixes it, however allows users to change them again, hence we cannot remove the on-interact block.

Can we get a workaround for this on spawner blocks (#52)