Fix up schema to only be configured if set (#912)

Author: dereuromark

src/CakeAdapter.php

@@ -59,8 +59,9 @@ public function __construct(AdapterInterface $adapter, ?Connection $connection =
 
         if ($connection->getDriver() instanceof Postgres) {
             $config = $connection->config();
-            $schema = empty($config['schema']) ? 'public' : $config['schema'];
-            $pdo->exec('SET search_path TO ' . $pdo->quote($schema));
+            if (!empty($config['schema'])) {
+                $pdo->exec('SET search_path TO ' . $pdo->quote($config['schema']));
+            }
         }
 
         $driver = $connection->getDriver();