Werk #16395: "Cisco Devices: Temperature Sensors" Revert: used wrong lower device levels

In Werk #16276, we replaced the "less than" comparison by the "less or equal" comparison. This is not consistent with how Checkmk handles lower levels, despite what the Werk claims. This Werk restores the old behavior before Werk #16276. Note, that Werk #16276 also uncovered some Cisco devices, which report faulty thresholds for "less or equal". These thresholds are now ignored again.

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