fix errors in jsonapi code, fixes #1228

lib/classes/JsonApi/Routes/Blubber/FilterTrait.php

...nApi/Routes/CourseMemberships/CourseMembershipsUpdate.php

...lasses/JsonApi/Routes/Courses/CoursesMembershipsIndex.php

lib/classes/JsonApi/Routes/Courses/Rel/Memberships.php

lib/classes/JsonApi/Routes/Courseware/Authority.php

lib/classes/JsonApi/Routes/Courseware/ContainersUpdate.php

...utes/Courseware/Rel/UsersBookmarkedStructuralElements.php

...onApi/Routes/Courseware/StructuralElementsImageUpload.php

lib/classes/JsonApi/Routes/Courseware/TemplatesIndex.php

lib/classes/JsonApi/Routes/Events/UserEventsIcal.php

lib/classes/JsonApi/Routes/Files/FileRefsUpdate.php

lib/classes/JsonApi/Routes/Files/FoldersDelete.php

lib/classes/JsonApi/Routes/Files/RoutesHelperTrait.php

lib/classes/JsonApi/Routes/Forum/ForumCategoriesDelete.php

lib/classes/JsonApi/Routes/Forum/ForumEntriesDelete.php

lib/classes/JsonApi/Routes/News/ByCurrentUser.php

lib/classes/JsonApi/Routes/News/ByUserIndex.php

lib/classes/JsonApi/Routes/News/CommentsIndex.php

lib/classes/JsonApi/Routes/News/NewsUpdate.php

lib/classes/JsonApi/Routes/News/Rel/Ranges.php