fix string handling on test "Does full font name begin with the font family name?"
fix string handling on test "Does full font name begin with the font family name?"

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