Remove unused variables from setupTemplate

Remove unused variables from setupTemplate

Both $repository and $cache_dir are never used, no other skin/
extension makes use of that, variables are defined just because of
PHP Strict standards.

IMHO there is no need to define those, all Skins that extend
Skin class define optional params so PHP will not complain.

Change-Id: I059415a795e5836b9399890ecfd4fb5ee1888ac3