Lily pad sound events are shared with big dripleaves despite having the latter's name

Despite some of the big dripleaf-related sound events now encompassing lily pads as of Minecraft snapshot 22w44a, the sound events remain with the same ID. For consistency, I would expect these sound events to follow a pattern indicating the commonalities between the two bushes rather than block.big_dripleaf.*.

Relates to MC-279276, MC-279995

Steps to reproduce

1. Run /playsound minecraft:block.big_dripleaf.break
2. Observe that running /playsound minecraft:block.lily_pad.break does not have a sound