selftests/bpf: Exercise SOCK_STREAM unix_inet_redir_to_connected()

Constants got switched reducing the test's coverage. Replace SOCK_DGRAM
with SOCK_STREAM in one of unix_inet_skb_redir_to_connected() tests.

Fixes: 51354f70 ("bpf, sockmap: Add af_unix test with both sockets in map")
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Tested-by: Jakub Sitnicki <jakub@cloudflare.com>
Suggested-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Link: https://lore.kernel.org/r/20240731-selftest-sockmap-fixes-v2-5-08a0c73abed2@rbox.coSigned-off-by: Martin KaFai Lau <martin.lau@kernel.org>

tools/testing/selftests/bpf/prog_tests/sockmap_listen.c

@@ -1793,7 +1793,7 @@ static void unix_inet_skb_redir_to_connected(struct test_sockmap_listen *skel,
 	unix_inet_redir_to_connected(family, SOCK_DGRAM,
 				     sock_map, -1, verdict_map,
 				     REDIR_EGRESS, NO_FLAGS);
-	unix_inet_redir_to_connected(family, SOCK_DGRAM,
+	unix_inet_redir_to_connected(family, SOCK_STREAM,
 				     sock_map, -1, verdict_map,
 				     REDIR_EGRESS, NO_FLAGS);