Werk #11680: qnap_fans: update default parameters

Component	Checks & agents
Title	qnap_fans: update default parameters
Date	Nov 4, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Broken fans can be detected by lower thresholds (not upper thresholds). The default parameters have been adapted accordingly.

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