REGTEST: http-capture/h00000: Relax a regex matching the log message

Size reported in logs may differ between legacy HTTP and HTX, at least for
now. So in the regtest http-capture/h00000.vtc, we need to relax the regex
matching the log message.

reg-tests/http-capture/h00000.vtc

@@ -7,7 +7,7 @@ feature ignore_unknown_macro
 
 syslog S -level info {
     recv
-    expect ~ "[^:\\[ ]\\[${h_pid}\\]: .* .* fe be/srv .* 200 17641 - - ---- .* .* {HPhx8n59qjjNBLjP} {htb56qDdCcbRVTfS} \"GET / HTTP/1\\.1\""
+    expect ~ "[^:\\[ ]\\[${h_pid}\\]: .* .* fe be/srv .* 200 1[0-9]{4} - - ---- .* .* {HPhx8n59qjjNBLjP} {htb56qDdCcbRVTfS} \"GET / HTTP/1\\.1\""
 } -start
 
 server s {