hexdump: Remove expected test failures for now succeeding tests

r323990 fixed the -s flag breakage reported by PR 219173. Mark the
corresponding hexdump tests accordingly, since they should now both succeed.

PR:		222781
Reported by:	ngie
Reviewed by:	emaste, ngie
Approved by:	emaste (mentor)
Differential Revision:	https://reviews.freebsd.org/D12590

usr.bin/hexdump/tests/hexdump_test.sh

@@ -134,7 +134,6 @@ s_flag_head()
 }
 s_flag_body()
 {
-	atf_expect_fail "-s option is currently broken due to capsicum (PR 219173)"
 	atf_check -o file:"$(atf_get_srcdir)/d_hexdump_sflag_a.out" \
 	    hexdump -bs 4 "$(atf_get_srcdir)/d_hexdump_a.in"
 
@@ -148,7 +147,6 @@ v_flag_head()
 }
 v_flag_body()
 {
-	atf_expect_fail "-s option is currently broken due to capsicum (PR 219173)"
 	for i in $(seq 0 7); do
 		atf_check -o match:"^\*$" \
 		    hexdump -s ${i} "$(atf_get_srcdir)/d_hexdump_c.in"