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 Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p26 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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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