Remove unused refs from forms

src/views/settings/components/ActivityPub.vue

src/views/settings/components/Authentication.vue

src/views/settings/components/AutoLinker.vue

src/views/settings/components/Captcha.vue

src/views/settings/components/Esshd.vue

src/views/settings/components/Frontend.vue

src/views/settings/components/Gopher.vue

src/views/settings/components/Http.vue

src/views/settings/components/Instance.vue

src/views/settings/components/JobQueue.vue

src/views/settings/components/Logger.vue

src/views/settings/components/Mailer.vue

src/views/settings/components/MediaProxy.vue

src/views/settings/components/Metadata.vue

src/views/settings/components/Other.vue

src/views/settings/components/RateLimiters.vue

src/views/settings/components/Upload.vue

src/views/settings/components/WebPush.vue