fix pathname for fontbakery/specifications directory
fix pathname for fontbakery/specifications directory

(issue #1461)

graphicore/fontbakery,googlefonts/fontbakery,moyogo/fontbakery,moyogo/fontbakery,googlefonts/fontbakery,graphicore/fontbakery,graphicore/fontbakery,moyogo/fontbakery,googlefonts/fontbakery