Fix issue where list event close on scroll

Ghost User
2019-06-26T20:14:06+02:00

Closes #863

#### Previous behaviour
Steps to reproduce:

1. Open an event on a mobile (Chrome + Android!?) device while having a scroll position to the top
2. Scroll
3. The event collapses

#### New behaviour
Steps to validate that it works:

1. Open an event on a mobile (Chrome + Android!?) device while having a scroll position to the top
2. Scroll
3. The event does not automatically collapse