Restore api.php?summary response format

[rdwebdesign]

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• I have read and understood the contributors guide, as well as this entire template.
• I have made only one major change in my proposed changes.
• I have commented my proposed changes within the code.
• I have tested my proposed changes.
• I am willing to help maintain this change if there are issues with it later.
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What does this PR aim to accomplish?:

A recent modification in API changed the response format of api.php?summary.
This PR restores the old format.

How does this PR accomplish the above?:

Restoring the old functions only in "summary" response.
Note: calling the API using api.php?summaryRaw or api.php (without parameters) will return the new format.

What documentation changes (if any) are needed to support this PR?:

I don't know.
Maybe the differences between api.php?summary and api.php?summaryRaw should be more explicit.

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-ftl-v5-14-web-v5-11-and-core-v5-9-released/53529/1