smbd: simplify create_action handling

smbd: simplify create_action handling

(state->info == FILE_WAS_OVERWRITTEN) can only happen when returning
SMB_VFS_CREATE_FILE(), not for a Durable Handle reconnect or Replay, hence we
can move the check and adjustment of state->info to smbd_smb2_create_send()
after the call to SMB_VFS_CREATE_FILE().

This nicely simplifies the logic in smbd_smb2_create_finish() where we can now
just set state->op->create_action and state->out_create_action to the value of
state->info.

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>