TCP: Init the default conn profile even without any listeners

This fixes an issue with outgoing TCP connections being initialized with
buggy parameters (timeout: 0, lifetime: 0, etc.), when there are no TCP
listeners.

(cherry picked from commit 96252b6)

net/net_tcp.c

@@ -1725,6 +1725,8 @@ int tcp_init(void)
 			break;
 		}
 
+	tcp_init_con_profiles();
+
 	if (tcp_disabled)
 		return 0;
 
@@ -1746,8 +1748,6 @@ int tcp_init(void)
 		}
 	}
 
-	tcp_init_con_profiles();
-
 	tcp_workers_max_no = (s_profile && (tcp_workers_no<s_profile->max_procs)) ?
 		s_profile->max_procs : tcp_workers_no ;