Modify the way the update shows available updates

[nielsnl68]

Breaking change

When the Update display is shown, the top section shows the new version number. To me it looks as if that is the current version.
Showing the new version was already shown double.

Proposed change

This PR will change this by showing "Update Available" instead.

ESPHome (dev) Update
3 uur geleden                                2024.6.0-dev20240510

into:

ESPHome (dev) Update
3 uur geleden                                    Update available

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

No Change in configuration scripts needed.

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[home-assistant]

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[home-assistant]

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[nielsnl68]

thanks for the merge :D