yet another purely aesthetic commit

src/graphql/models/groupModel.ts

src/graphql/models/messageModel.ts

src/graphql/models/requestModel.ts

src/graphql/models/userModel.ts

src/graphql/object_resolvers/groups.ts

src/graphql/object_resolvers/messages.ts

src/graphql/object_resolvers/requests.ts

src/graphql/object_resolvers/users.ts

src/graphql/resolvers.ts