Some block tags pluralize "replaceable" and some don't

List of those that do:

• deepslate_ore_replaceables
• nether_carver_replaceables
• overworld_carver_replaceables
• stone_ore_replaceables

Those that don't:

• ancient_city_replaceable
• azalea_root_replaceable
• lush_ground_replaceable
• moss_replaceable
• sculk_replaceable
• sculk_replaceable_worldgen

Noteworthy:

• dripstone_replaceable_blocks

Although replaceble can be both a noun (in which case it should be plural to be consistent with other tags) and an adjective (in which case it shouldn't be plural because adjectives don't have plurals) I think being consistent is important.

`dripstone_replaceable_blocks` is also a bit of a weird exception.