fix: Allow schema names with special characters in the search path

Fixes regression where the search path did not recognize schemas with uppercase, spaces and other special characters in their names.

test/spec/fixtures/privileges.sql

@@ -8,6 +8,8 @@ GRANT USAGE ON SCHEMA
     , extensions
     , v1
     , v2
+    , "SPECIAL ""@/\#~_-"
+    , "EXTRA ""@/\#~_-"
 TO postgrest_test_anonymous;
 
 -- Schema test objects
@@ -190,6 +192,7 @@ GRANT ALL ON TABLE
     , bulk_update_items_cpk
     , shops
     , shop_bles
+    , "SPECIAL ""@/\#~_-".names
 TO postgrest_test_anonymous;
 
 GRANT INSERT ON TABLE insertonly TO postgrest_test_anonymous;