[QA] UI details about background scan should be hidden, when background scan is disabled

[jnweiger]

Seen with files_antivirus 1.2.1-rc.1 (probably not a regression)

• enable files_antivirus app
• visit admin general settings
• switch background scan from 'Enabled' to 'Disabled'
• The choice what to do with background scan results is still visible. BAD

Expected behaviour:

• as everything else in the antrivirus UI changes nicely according to context, this setting should do the same.

[jnweiger]

(Transifex now has Wirksache und Urkung in the right order: "Wenn infizierte Dateien bei einem Hintergrund-Scan gefunden werden", urks.)

[phil-davis]

• enable files_antivirus app
• visit admin security settings
• switch background scan from 'Enabled' to 'Disabled'

[jnweiger]

Confirmed fixed in 1.2.2-rc.1 Thanks @prsnbrg !