Fix typo in font test sample (#6571)
Fix typo in font test sample (#6571)


poire-z/koreader,Frenzie/koreader,mwoz123/koreader,NiLuJe/koreader,NiLuJe/koreader,koreader/koreader,Hzj-jie/koreader,pazos/koreader,Frenzie/koreader,koreader/koreader,Markismus/koreader,poire-z/koreader