Removed duplicate loading of bottom scripts.

BaseTemplate::printTrail() renders the 'bottomscripts' variable, which is set to $this->bottomScripts() in SkinTemplate::prepareQuickTemplate().

Change-Id: Ic3722b106b2fcdb7bf1c190d26f9b54ed0fb5942
Skin::bottomScripts() in turn calls OutputPage::getBottomScripts() and runs the SkinAfterBottomScripts hook.