Make sure Filters initial load re-evaluates viewport width

[RobertJoonas]

Changes

Another regression caused by the class component refactor in filters.js. On the initial load on mobile screens, the viewport is left to the default 1080 while it should be re-evaluated.

Tests

• [ ] Automated tests have been added
• [x] This PR does not require tests

Changelog

• [ ] Entry has been added to changelog
• [x] This PR does not make a user-facing change

Documentation

• [ ] Docs have been updated
• [x] This change does not need a documentation update

Dark mode

• [ ] The UI has been tested both in dark and light mode
• [x] This PR does not change the UI