app.ini.sample: add ENABLE_USER_HEATMAP default config (#5362)
app.ini.sample: add ENABLE_USER_HEATMAP default config (#5362)

Doc: https://github.com/go-gitea/gitea/blob/b97af15de67b04fd259bd70a4abbc873f12e9491/docs/content/doc/advanced/config-cheat-sheet.en-us.md#service-service
typeless/gitea,lunny/gitea,vdbt/gitea,sapk-fork/gitea,vCaesar/gitea,typeless/gitea,Bwko/gitea,vCaesar/gitea,lafriks/gitea,typeless/gitea,lafriks/gitea,lunny/gitea,kubatyszko/gitea,go-gitea/gitea,Bwko/gitea,sapk-fork/gitea,cez81/gitea,lunny/gitea,typeless/gitea,lafriks/gitea,kubatyszko/gitea,kubatyszko/gitea,sapk-fork/gitea,go-gitea/gitea,cez81/gitea,sapk-fork/gitea,cez81/gitea,vdbt/gitea,go-gitea/gitea,Bwko/gitea