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Fix minetest.clear_* creating new LOCAL table instead of clearing the…
… existing one. On calling clear_redistered_biomes the registered_biomes table is cleared by creating a new empty table, but the pointer is not updated to point to the new one. So after calling more register_biome, the registered_biome table always contains 0 items, which is an error. Instead, the table is cleared by removing all its items so the pointer (minetest.registered_*) remains valid.
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