Fix transaction status collection not filtered very efficiently

[ma4nn]

This PR fixes a huge performance drawback introduced by the change in 5231b7ff in the transaction status controller.

The issue is caused by the fact that the collection is not filtered on database level resulting in all status entries being loaded.

[leissbua]

Guys at Payone should merge this, the current way is quite stupid, as they load the whole collection each time:

    /**
     * Search all items by field value
     *
     * @param   string $column
     * @param   mixed $value
     * @return  array
     */
    public function getItemsByColumnValue($column, $value)
    {
        $this->load();

        $res = [];
        foreach ($this as $item) {
            if ($item->getData($column) == $value) {
                $res[] = $item;
            }
        }
        return $res;
    }