Pre-select greenbone sensor as default scanner type (backport #2867)

[mergify]

This is an automatic backport of pull request #2867 done by Mergify.
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Cherry-pick of 42310dc has failed:

On branch mergify/bp/gsa-21.10/pr-2867
Your branch is ahead of 'origin/gsa-21.10' by 2 commits.
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[swaterkamp]

Changes are already in 21.10