fix typo in ADE progress message string

[ejarvi]

Description

Fixes a typo in the Azure Disk Encryption progress message string (changes "metada" to "metadata")

GitHub issue: #7438

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate change log has been updated
• The PR does not introduce breaking changes
• [N/A] If applicable, the changes made in the PR have proper test coverage
• [N/A] For public API changes to cmdlets:
  • [N/A] the changes have gone through a cmdlet design review
  • [N/A] the cmdlet markdown files were generated using the platyPS module

[cormacpayne]

@ejarvi thanks for the quick fix, Eric!