fix #1934 - Installation fails on Ubuntu 25.10 (debian package due to libcec package name)

[MutzelMe]

libcec6 is not available with Ubuntu 25.10. repository, but libcec7

Summary
Installation on Ubuntu 25.10 fails due to libcec package name.

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI of web configuration, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing setups:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's body (e.g. Fixes: #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated (docs/docs/en)
• Related tests have been updated

PLEASE DON'T FORGET TO ADD YOUR CHANGES TO CHANGELOG.MD

• Yes, CHANGELOG.md is also updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[Lord-Grey]

@MutzelMe Thank you very much for your contribution!
I will merge the PR and then the updated deb package should be available with the next successful nightly build.