Fixes TTL cache key name

[ngiraud]

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1️⃣ Why should it be added? What are the benefits of this change?
There is an issue with the name of the default_ttl cache config set here.
This concerns the issue submitted yesterday : #4226

2️⃣ Does it contain multiple, unrelated changes? Please separate the PRs out.
No

3️⃣ Does it include tests, if possible?
There are tests but I haven't touch them.
See this PR.

4️⃣ Any drawbacks? Possible breaking changes?

5️⃣ Mark the following tasks as done:

• Checked the codebase to ensure that your feature doesn't already exist.
• Take note of the contributing guidelines.
• Checked the pull requests to ensure that another person hasn't already submitted a fix.
• Added tests to ensure against regression.

6️⃣ Thanks for contributing! 🙌