Fix/grapghql cms block

[ResuBaka]

Related issues

closes #

Short description and why it's useful

Fixed graphql sort option and cms_blocks.

Screenshots of visual changes before/after (if there are any)

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• 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

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[ResuBaka]

Added a small improvement to the sort fix. Here was still not the full fix in it where the key needs to be checked for _score as this needs to be default to DESC and not ASC.