refactor: Readable widget naming for debug window

[s1Sharp]

Fixed widget names in the debug window. Make it more developer friendly to avoid confusion inside Qt Designer.

[DrahtBot]

The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

Reviews

See the guideline for information on the review process.
A summary of reviews will appear here.

Conflicts

Reviewers, this pull request conflicts with the following ones:

• #626 (Showing Local Addresses in Node Window by jadijadi)
• #bitcoin/bitcoin/28956 (Nuke adjusted time (attempt 2) by dergoegge)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

[s1Sharp]

Qt Designer view before changes:

Qt Designer view after changes:

And a few changes for other widget names that were not included in the screenshots.

Also property indent is unnessasary for QLabel: labelClientUserAgent

         <property name="indent">
          <number>10</number>
         </property>

[hebasto]

@s1Sharp

Thank you for your contribution!

However, I'm going to close this PR following our CONTRIBUTING Guide and to avoid unnecessary conflicts with other PRs.