fix: set table prefix on query grammar (#74)

Author: erikgaal

src/PostgresEnhancedConnection.php

@@ -117,6 +117,7 @@ public function serverVersion(): string
     protected function getDefaultQueryGrammar(): QueryGrammar
     {
         $grammar = new QueryGrammar();
+        $grammar->setTablePrefix($this->tablePrefix);
         if (method_exists($grammar, 'setConnection')) {
             $grammar->setConnection($this);
         }