blockbot-discord-2.0.0-beta.jar for 1.20.2

Improve tellraw selector filter (again)

I hope this is the last change that is required to satisfy everyone.
This improves the selection filter to compare it to the second last
node, which for tellraw should always be the selector! (This commit
allow commands like `/execute ... run tellraw @a [{"text":"test"}]` to
be broadcast.)