Werk #5742: windows_tasks: show the hexadecimal representation of the status code

schtasks.exe used by the check plugin windows_tasks.ps1 returns a signed integer value as the last result of a task. However, the status codes (e.g. on MSDN) are usually represented as a hexadecimal value. To make it easier to lookup a status code the hexadecimal value is now shown by the check plugin.

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