[Issue] Change theme name in grunt config

[m2-assistant]

This issue is automatically created based on existing pull request: #39413: Change theme name in grunt config

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Description (*)

Change theme name in grunt config as the file itself is named themes.js not local-themes.js.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

[m2-assistant]

Hi @engcom-Hotel. Thank you for working on this issue.
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[engcom-Hotel]

Hello @sippsolutions,

Thanks for the report and collaboration!

As there is nothing to reproduce in this issue, hence after looking into the code changes, we are confirming this issue for further processing.

Thanks