Update Anton families to display (#9269)

* Change Anton to DISPLAY

* Update Anton SC to Display

* Update Antonio to Display

ofl/anton/METADATA.pb

 name: "Anton"
 designer: "Vernon Adams"
 license: "OFL"
-category: "SANS_SERIF"
+category: "DISPLAY"
 date_added: "2011-02-23"
 fonts {
   name: "Anton"

ofl/antonio/METADATA.pb

 name: "Antonio"
 designer: "Vernon Adams"
 license: "OFL"
-category: "SANS_SERIF"
+category: "DISPLAY"
 date_added: "2013-03-06"
 fonts {
   name: "Antonio"

ofl/antonsc/METADATA.pb

 name: "Anton SC"
 designer: "Vernon Adams"
 license: "OFL"
-category: "SANS_SERIF"
+category: "DISPLAY"
 date_added: "2024-05-27"
 fonts {
   name: "Anton SC"