hugolib: Include full filepath on shortcode errors
hugolib: Include full filepath on shortcode errors

Fixes #3079

gohugoio/hugo,anthonyfok/hugo,digitalcraftsman/hugo,fedelibre/hugo,gohugoio/hugo,fedelibre/hugo,anthonyfok/hugo,mdhender/hugo,gohugoio/hugo,digitalcraftsman/hugo,mdhender/hugo,mitchchn/hugo,anthonyfok/hugo,fedelibre/hugo,mitchchn/hugo,fedelibre/hugo,mdhender/hugo,mdhender/hugo