machines/HV/quarry.lua: [modification] provide a basic digger object to can_dig callbacks to prevent nil object errors (#425)

Minetest game's doors mod was known to cause server errors when passed a nil digger in it's can_dig callback,
due to always attempting to invoke digger:get_player_name().
Fix this by providing a basic fake player which provides this method to can_dig callbacks.
(It should be noted that currently this fix causes doors to be undiggable by quarries.)

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