tests: fix wget test in utils/trace.exp

This should fix the following error[1]:

    runner@fv-az1230-523:~/work/firejail/firejail/test/utils$
    <ail/test/utils$ firejail --trace wget -q debian.org
    [...]
    5:wget:stat64 index.html:-1
    5:wget:stat64 index.html:-1
    5:wget:stat64 /home/runner/.netrc:-1
    5:wget:socket AF_INET SOCK_STREAM IPPROTO_IP:4
    5:wget:connect 4 151.101.66.132 port 80:0
    5:wget:stat64 index.html:-1
    5:wget:stat64 index.html:-1
    5:wget:stat64 index.html:-1
    [...]
    TESTING ERROR 8.6

[1] https://github.com/kmk3/firejail/actions/runs/6004266783/job/16284476671

test/utils/trace.exp

@@ -73,6 +73,7 @@ expect {
 }
 expect {
 	timeout {puts "TESTING ERROR 8.6\n";exit}
+	"wget:stat64 index.html" {puts "OK\n";}
 	"wget:fopen64 index.html" {puts "OK\n";}
 	"wget:fopen index.html" {puts "OK\n";}
 	"Parent is shutting down" {puts "OK\n";}