Disable prettiers no-else-return rule

[yubiuser]

• 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.
• I give this submission freely and claim no ownership.
• It is compatible with the EUPL 1.2 license
• I have squashed any insignificant commits. (git rebase)
• I have Signed Off all commits. (git commit --signoff)

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What does this PR aim to accomplish?:
Prettier has a no-else-after-return rule which errors if an else statement follows an if clause with a return.
https://eslint.org/docs/rules/no-else-return

Although it is technically correct to omit the else, I think it greatly enhances the readability of the code. Additionally, the code will not fail, if the return within the if will be removed by a code change in the future.
Disabling the rule has no negative consequences: the else is not mandatory.

How does this PR accomplish the above?:
Disables the rule by setting "no-else-return": "off" in package.json

[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-v5-15-web-v5-12-and-core-v5-10-released/54987/1