BUG/MINOR: spoe: Don't report error on applet release if filter is in DONE state

BUG/MINOR: spoe: Don't report error on applet release if filter is in DONE state

When the SPOE applet was released, if a SPOE filter context was still
attached to it, an error was reported to the filter. However, there is no
reason to report an error if the ACK message was already received. Because
of this bug, if the ACK message is received and the SPOE connection is
immediately closed, this prevents the ACK message to be processed.

This patch should be backported to 3.1.

(cherry picked from commit 1cd30c998bce72166855d6b83a8e6865c33095a1)
Signed-off-by: Willy Tarreau <w@1wt.eu>