fix implementation of "Monospace font has hhea.advanceWidthMax..."
fix implementation of "Monospace font has hhea.advanceWidthMax..."

"... equal to each glyph's advanceWidth ?"
(issue #970)

It was only running for fonts with a METADATA.pb file.
But it can actually be run regardless of that so I moved it
outside the GoogleFonts-specific block of checks.

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