Werk #12607: Fix deletion of failed notifications

Component	User interface
Title	Fix deletion of failed notifications
Date	Mar 19, 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) 2.0.0p2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Failed notification were not deleted on confirm. Furthermore, the main dashboard was opened after confirm.

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