Need a longer test substring for text/x-handlebars-template

For `<script type="text/x-handlebars-template">`, using a 30 char substring, "type" is truncated from beginning of substring, so regex fails, so I bumped it up to 40.

Note that an id is required for handlebars, so if it happens to be after type attribute like `<script type="text/x-handlebars-template" id="top-navigation">` the substring needs to be *much* longer than 40 chars.