Werk #12116: Fix default formatting for predictive levels

Component	Checks & agents
Title	Fix default formatting for predictive levels
Date	Feb 11, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

In some cases it was possible that the result summary of a predictive level check contained '%.2f' instead of the measured value. Now the measured value should be displayed correctly.

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