[cisco_meraki] Fix contains check for forwarded tag

[marc-gr]

Automated PR.

Fix contains check for forwarded tag.

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[P1llus]

Missing PR number in changelog, but thats all

[elasticmachine]

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• Start Time: 2021-10-05T08:27:37.974+0000

• Duration: 16 min 30 sec

• Commit: a26d4be

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Total	7

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