Revert "h09client: Coalesces first stream data to the final handshake packet"
Revert "h09client: Coalesces first stream data to the final handshake packet"

This reverts commit 66a7cb4d75c693a3beaddd7bb9b31754ff286f17.

ngtcp2/ngtcp2,ngtcp2/ngtcp2,ngtcp2/ngtcp2