fix checkboxes, specifically the NSFW one

src/components/checkbox/checkbox.vue

src/components/color_input/color_input.vue

src/components/font_control/font_control.vue

src/components/opacity_input/opacity_input.vue

src/components/range_input/range_input.vue

src/components/selectable_list/selectable_list.vue

src/components/settings_modal/helpers/boolean_setting.vue

src/components/settings_modal/settings_modal.vue

src/components/user_reporting_modal/user_reporting_modal.vue