Deactivating of jquery event could interfere with other JS on a page

[Philipp Memmel]

The issue is the following line:

https://bitbucket.org/dw8/moodle-format_tiles/src/2f52e9a09a093de077c33172a838d0b23a1edf39/amd/src/course.js#lines-709

Here, the scroll event is completely being shut down globally which means that other JS running on this site (for example some JS functions which show a header/menu depending on the current scroll state) cannot use this event anymore.