Align "Packed Mud" with "Compressed Ice" naming (en_GB)

In the English (United Kingdom) language setting, the block packed_ice is referred to as "Compressed Ice", while packed_mud remains unchanged (Packed Mud). For consistency and parity in naming conventions, I suggest renaming "Packed Mud" to "Compressed Mud" in the English (United Kingdom) language setting.

Thank you,
Zinc Soulfate