Fix typo for #3960 causing use of filter instead of notFilter

[cewald]

Related Issues

Bugfix for #3960

Short Description and Why It's Useful

@pkarw @andrzejewsky I added a typo when I created a new branch because of the mess I caused by rebasing it with the wrong branch. After I was double checking the new PR I saw that Piotr already merged it – this is the fix. Sorry for the fuss.

Which environment this relates to

Check your case. In case of any doubts please read about Release Cycle

• Test version (https://test.storefrontcloud.io) - this is a new feature or improvement for Vue Storefront. I've created branch from develop branch and want to merge it back to develop
• RC version (https://next.storefrontcloud.io) - this is a stabilisation fix for Release Candidate of Vue Storefront. I've created branch from release branch and want to merge it back to release
• Stable version (https://demo.storefrontcloud.io) - this is an important fix for current stable version. I've created branch from hotfix or master branch and want to merge it back to hotfix

Upgrade Notes and Changelog

• No upgrade steps required (100% backward compatibility and no breaking changes)
• I've updated the Upgrade notes and Changelog on how to port existing VS sites with this new feature

IMPORTANT NOTICE - Remember to update CHANGELOG.md with description of your change

Contribution and currently important rules acceptance

• I read and followed contribution rules

[pkarw]

Thanks