improve format of callbacks on collection document removal

.../imports/api/breakouts/server/modifiers/clearBreakouts.js

...l5/imports/api/captions/server/modifiers/clearCaptions.js

.../api/group-chat-msg/server/modifiers/clearGroupChatMsg.js

...imports/api/group-chat/server/modifiers/clearGroupChat.js

...on-html5/imports/api/polls/server/modifiers/clearPolls.js

...ad-token/server/modifiers/clearPresentationUploadToken.js

.../api/presentations/server/modifiers/clearPresentations.js

...-html5/imports/api/slides/server/modifiers/clearSlides.js

...api/users-settings/server/modifiers/clearUsersSettings.js

...on-html5/imports/api/users/server/modifiers/clearUsers.js

...ports/api/voice-users/server/modifiers/clearVoiceUsers.js