Werk #12862: slack: Fix ignored proxy option

Component	Notifications
Title	slack: Fix ignored proxy option
Date	May 5, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	1.6.0p25 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

With werk #12857 the option to configure a proxy for notification method "Slack or Mattermost" was added.

However, this option was not taken into account in version 1.6.0p24 when processing the notification.

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