Update Playfair Display (to fix misaligned Latvian cedilla accents)

Some combined diacritic characters in the Google Fonts version of Playfair Display are misaligned.

I see the issue in Latvian letters "ķ", "ļ", "ņ", and "ŗ".
As you can see, the cedillas are left-aligned and kerning is off around the affected characters.

Same issue has been reported for Romanian letters "ș" and "ț" in comments on #7 and I can confirm it.

To clarify, the misaligned Latvian diacritics are:

- ķ (kcommaaccent) latin small letter k with cedilla
- ļ (lcommaaccent) latin small letter l with cedilla
- ņ (ncommaaccent) latin small letter n with cedilla
- ŗ (rcommaaccent) latin small letter r with cedilla

for Romanian:
- ș (scommaaccent) latin small letter s with comma below (also used in Turkish and other languages)
- ț (uni021B) latin small letter t with comma below

There may be other combined characters with similar issues.

I already reported this issue via fonts.google.com feedback form but decided to investigate.
Apparently, the issue is not present in the https://github.com/clauseggers/Playfair-Display, so I'm reporting it here.