[pg] fix getting table information if search_path contains escaped sc…

…hema name (eg "812pp")

also simplifies the code and now exactly matches postgresql search rules

lib/Doctrine/DBAL/Platforms/PostgreSqlPlatform.php

@@ -355,7 +355,7 @@ private function getTableWhereClause(string $table, string $classAlias = 'c', st
             [$schema, $table] = explode('.', $table);
             $schema           = $this->quoteStringLiteral($schema);
         } else {
-            $schema = "ANY(string_to_array((select replace(replace(setting,'\"\$user\"',user),' ','') from pg_catalog.pg_settings where name = 'search_path'),','))";
+            $schema = 'ANY(current_schemas(true))';
         }
 
         $table = new Identifier($table);