esp_tinyuf2: fix nvs hidden key (AEGHB-961)

[wormyrocks]

Description

Allows the use of hidden NVS keys in the uf2 config.ini.
Also fixes an error where NVS entries intended to be hidden would be shown, and entries intended to be shown would be hidden.

[CLAassistant]

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[github-actions]

	Warnings
⚠️	Some issues found for the commit messages in this PR: the commit message "Genericize MSC callback, allowing application to follow update progress": summary looks empty type/action looks empty the commit message "don't save hidden values": summary looks empty type/action looks empty the commit message "esp_tinyuf2: fix nvs hidden key": summary looks too short type/action should be one of [change, ci, docs, feat, fix, refactor, remove, revert, test] the commit message "esp_tinyuf2: pass back config string in callback": type/action should be one of [change, ci, docs, feat, fix, refactor, remove, revert, test] the commit message "include temp fix from github issue 454/ AEGHB-940": probably contains Jira ticket reference (AEGHB-940). Please remove Jira tickets from commit messages. summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).
⚠️	Please consider squashing your 6 commits (simplifying branch history).

👋 Hello wormyrocks, we appreciate your contribution to this project!

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[lijunru-hub]

@wormyrocks LGTM！

[leeebo]

@wormyrocks, is there any difference? Whether there is a formal parameter or not, makes no difference to the function itself.

[wormyrocks]

On my machine it won't compile without this change - something to do with the compiler settings in tinyuf2.
Outside of the include guards, all the other declarations in that file follow the same style.

[leeebo]

@wormyrocks thanks for your contribution, It looks great to me!

[Copilot]

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

[leeebo]

Hi @wormyrocks, this PR is blocked because the CLA has not been signed. Please sign it when you're free, and we will merge it then. #462 (comment)