TT#47004 add headerrules api-root

Change-Id: I2234929ae0d31621b102a9a1da4c64413c2bc24f

t/api-rest/api-root.t

@@ -87,6 +87,10 @@ $ua = Test::Collection->new()->ua();
         interceptions => 1,
         invoices => 1,
         invoicetemplates => 1,
+        headerrulesets => 1,
+        headerrules => 1,
+        headerruleconditions => 1,
+        headerruleactions => 1,
         lnpcarriers => 1,
         lnpnumbers => 1,
         mailtofaxsettings => 1,