Fix Firewall dashboards

[tdancheva]

What does this PR do?

This PR fixes a typo, replacing azure.account.id with cloud.account.id.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

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• Start Time: 2023-07-14T08:40:25.665+0000

• Duration: 15 min 13 sec

Test stats 🧪

Test	Results
Failed	0
Passed	83
Skipped	0
Total	83

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (10/10)	💚
Files	86.364% (19/22)	❕
Classes	86.364% (19/22)	❕
Methods	83.333% (155/186)	❕
Lines	85.003% (2817/3314)	❕
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package azure - 1.5.27 containing this change is available at https://epr.elastic.co/search?package=azure