Werk #17491: Fix alert handler rule deleting and order update

Component	Alert handlers
Title	Fix alert handler rule deleting and order update
Date	Jan 24, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0b1 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Manual sorting/moving and deleting of alert handler rules was not saved. Now updating rule order and deleting rules works as expected

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