capsicum-test: rights are propagated on sctp_peeloff(2)

As of commit 91a9e4e ("capsicum: propagate rights on sctp_peeloff")
a capability is generated from sctp_peeloff(cap_fd,...).  Enable the
corresponding test code.

PR:		201052
Reviewed by:	oshogbo, tuexen
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D47000

contrib/capsicum-test/capsicum-freebsd.h

@@ -62,10 +62,9 @@ typedef unsigned long cap_ioctl_t;
 // As of commit 85b0f9de11c3 ("capsicum: propagate rights on accept(2)")
 // FreeBSD generates a capability from accept(cap_fd,...).
 #define CAP_FROM_ACCEPT
-// TODO(FreeBSD): uncomment if/when FreeBSD propagates rights on sctp_peeloff.
-// FreeBSD does not generate a capability from sctp_peeloff(cap_fd,...).
-// https://bugs.freebsd.org/201052
-// #define CAP_FROM_PEELOFF
+// As of commit 91a9e4e01dab ("capsicum: propagate rights on sctp_peeloff")
+// FreeBSD generates a capability from sctp_peeloff(cap_fd,...).
+#define CAP_FROM_PEELOFF
 
 #endif  /* __FreeBSD__ */