revert: moved sprite cleanup to #425

...p/annuaire/annuaire-header/annuaire-header.component.html

src/app/models/structure.model.ts

src/app/shared/components/button/button.component.html

.../shared/components/hour-picker/hour-picker.component.html

.../v3/collapse/collapse-header/collapse-header.component.ts

src/assets/ico/calendar.svg

src/assets/ico/sprite.svg