Fix accented "i" characters in Groundhog

In the font Groundhog, the accented Í and Ì characters, as well as their lower-case versions í and ì, were swapped in position and had their accents facing the wrong direction.

Thank you to the user who reported this bug via email! I have scripts set up to do everything so it is quite painless for me to patch the fonts quickly, so reports like this are appreciated.