Remove another redundant "bugfix" (and in doing so, fix pg_copy_from)

Author: shish

generated/8.1/pgsql.php

@@ -173,7 +173,7 @@ private function displayParamsWithType(array $params): string
             $paramsAsString[] = $paramAsString;
         }
 
-        return str_replace('\\\\', '\\', implode(', ', $paramsAsString));
+        return implode(', ', $paramsAsString);
     }
 
     private function printFunctionCall(Method $function): string