Fix typo on email API settings endpoint

[Cyb3r-Jak3]

Description

The endpoint for enabling Email Routing for a zone is enable and not enabled

Has your change been tested?

Updated unit tests and they pass

Types of changes

What sort of change does your code introduce/modify?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• This change is using publicly documented (api.cloudflare.com or developers.cloudflare.com) and stable APIs.

[codecov-commenter]

Codecov Report

Merging #1060 (4bdba96) into master (e39278e) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1060   +/-   ##
=======================================
  Coverage   49.94%   49.94%           
=======================================
  Files         115      115           
  Lines       10991    10991           
=======================================
  Hits         5490     5490           
  Misses       4338     4338           
  Partials     1163     1163           

Impacted Files	Coverage Δ
teams_accounts.go	53.84% <ø> (ø)
email_routing_settings.go	60.00% <100.00%> (ø)
r2_bucket.go	100.00% <100.00%> (ø)

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[github-actions]

changelog detected ✅

[github-actions]

This functionality has been released in v0.49.0.

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