TT#18850 Fix dee760a: add test 'managersecretary' to api-root.t

Otherwise:

not ok 188 - check for valid link syntax

Use of uninitialized value $relname in exists at t/api-rest/api-root.t line 152.
Use of uninitialized value $relname in concatenation (.) or string at t/api-rest/api-root.t line 152.
not ok 189 - check for '' collection in Link

Use of uninitialized value $relname in delete at t/api-rest/api-root.t line 153.

Change-Id: Ib78e735e365b34404a06037b06dd7becdcf9917b

t/api-rest/api-root.t

@@ -87,6 +87,7 @@ $ua = Test::Collection->new()->ua();
         lnpnumbers => 1,
         mailtofaxsettings => 1,
         maliciouscalls => 1,
+        managersecretary => 1,
         metaconfigdefs => 1,
         ncoslevels => 1,
         ncoslnpcarriers => 1,