#2386 PHP 警告撲滅 for 2.13.3

Smarty で number_format へ値を渡す前に、float 型へ型変換.

git-svn-id: http://svn.ec-cube.net/open/branches/version-2_13-dev@23474 1e3b908f-19a9-db11-a64c-001125224ba8