Remove trailing slash from api paths

A proxy refused to include trailing slashes, and so they have been removed.

Resolves: GREG-76

greg/api/urls.py

@@ -26,31 +26,31 @@ urlpatterns = router.urls
 # Allowing trailing slashes to be optional for the URLs below
 urlpatterns += [
     re_path(
-        r"^persons/(?P<person_id>[0-9]+)/roles/?$",
+        r"^persons/(?P<person_id>[0-9]+)/roles$",
         RoleViewSet.as_view({"get": "list", "post": "create"}),
         name="person_role-list",
     ),
     re_path(
-        r"^persons/(?P<person_id>[0-9]+)/roles/(?P<id>[0-9]+)/?$",
+        r"^persons/(?P<person_id>[0-9]+)/roles/(?P<id>[0-9]+)$",
         RoleViewSet.as_view(
             {"get": "retrieve", "patch": "partial_update", "delete": "destroy"}
         ),
         name="person_role-detail",
     ),
     re_path(
-        r"^persons/(?P<person_id>[0-9]+)/identities/?$",
+        r"^persons/(?P<person_id>[0-9]+)/identities$",
         IdentityViewSet.as_view({"get": "list", "post": "create"}),
         name="person_identity-list",
     ),
     re_path(
-        r"^persons/(?P<person_id>[0-9]+)/identities/(?P<id>[0-9]+)/?$",
+        r"^persons/(?P<person_id>[0-9]+)/identities/(?P<id>[0-9]+)$",
         IdentityViewSet.as_view(
             {"get": "retrieve", "delete": "destroy", "patch": "partial_update"}
         ),
         name="person_identity-detail",
     ),
     re_path(
-        r"^sponsors/(?P<sponsor_id>[0-9]+)/guests/?$",
+        r"^sponsors/(?P<sponsor_id>[0-9]+)/guests$",
         SponsorGuestsViewSet.as_view({"get": "list"}),
         name="sponsor_guests-list",
     ),