KunenaTemplate->addScript never finds a "-min" version

Adding proper path to the filecheck.

It should also be considered to change JFactory::getDocument ()->addScript() to JHTML::Script() to allow overriding using the site template. See http://www.babdev.com/blog/139-use-the-media-folder-allow-overridable-media for this
Merge pull request #1840 from Bakual/patch-1

KunenaTemplate->addScript never finds a "-min" version