Werk #13111: Fix painter "Service notification number"

Component	User interface
Title	Fix painter "Service notification number"
Date	Aug 27, 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) 2.0.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p26 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The painter always showed 0 if no periodic notifications were enabled, even if the notification context showed 1 for the current service notification number.

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