okta: remove redundant rename processors

[efd6]

What does this PR do?

Removes a pair of redundant renames incorrectly introduced in #6010.

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: 2023-05-03T11:39:23.842+0000

• Duration: 14 min 51 sec

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Test	Results
Failed	0
Passed	7
Skipped	0
Total	7

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚
Classes	100.0% (1/1)	💚
Methods	100.0% (19/19)	💚
Lines	91.843% (563/613)	👎 -0.105
Conditionals	100.0% (0/0)	💚

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Package okta - 1.19.1 containing this change is available at https://epr.elastic.co/search?package=okta