Fix setting/displaying timeout in EditNvtDetailsDialog (backport #3057)

[mergify]

This is an automatic backport of pull request #3057 done by Mergify.
Cherry-pick of ee2c739 has failed:

On branch mergify/bp/gsa-21.10/pr-3057
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You are currently cherry-picking commit ee2c73941.
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	both modified:   CHANGELOG.md

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[bjoernricks]

21.10 branch got replaced by master.