Packed Mud can be mined faster with a shovel

Summary: Packed mud can be mined faster than normal when using a pickaxe or a shovel. Packed mud should only be mined faster than normal when using only a pickaxe.

Steps to Reproduce:

1. Place some packed mud blocks
2. Mine a packed mud block by hand.
3. Mine a packed mud block using a pickaxe.
4. Mine a packed mud block using a shovel.

Expected Results:

Packed mud is mined at normal speed by hand or using a shovel, and mined faster using a pickaxe.

Observed Results:

Packed mud is mined at normal speed by hand and mined faster using a pickaxe or a shovel.