Oops, forgot to log body in non-streaming cases

[jcheng5]

Repro:

library(elmer)

options(elmer_verbosity = 2)

chat <- chat_claude(model = "claude-3-5-sonnet-latest")
chat$chat("Hello.", echo = FALSE)
chat$chat_async("Hello.")

Without this fix, both of these log the requests but not the responses. (Note that in Positron, catting from async handlers doesn't always work, so the chat_async verbose output may not appear. Works fine from the terminal and presumably RStudio.)

[hadley]

This just confused me!