Mount PersonalAccessTokens API in EE only

The endpoint is EE only, so must be mounted only in the EE API class
(see https://gitlab.com/gitlab-com/gl-infra/production/-/issues/2495
for this breaking)

ee/lib/ee/api/api.rb

@@ -30,6 +30,7 @@ module EE
         mount ::API::Ldap
         mount ::API::LdapGroupLinks
         mount ::API::License
+        mount ::API::PersonalAccessTokens
         mount ::API::ProjectMirror
         mount ::API::ProjectPushRule
         mount ::API::MergeTrains

lib/api/api.rb

@@ -194,7 +194,6 @@ module API
       mount ::API::GoProxy
       mount ::API::Pages
       mount ::API::PagesDomains
-      mount ::API::PersonalAccessTokens
       mount ::API::ProjectClusters
       mount ::API::ProjectContainerRepositories
       mount ::API::ProjectEvents