Update qgslayoutscalebarwidgetbase.ui

[tarot231]

Make it the same appropriate label as other widgets like qgslayoutlabelwidgetbase, qgslayoutattributetablewidgetbase, etc.

The Screenshots are shown below.

New:

Old:

qgslayoutlabelwidgetbase:

qgslayoutattributetablewidgetbase:

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit c4eff90)

[qgis-bot]

@tarot231
This pull request has been tagged as requiring documentation.

A documentation ticket will be opened at https://github.com/qgis/QGIS-Documentation when this PR is merged.

Please update the description (not the comments) with helpful description and screenshot to help the work from documentors.
Also, any commit having [needs-doc] or [Needs Documentation] in will see its message pushed to the issue, so please be as verbose as you can.

Thank you!

[qgis-bot]

@tarot231
A documentation ticket has been opened at qgis/QGIS-Documentation#9167
It is your responsibility to visit this ticket and add as much detail as possible for the documentation team to correctly document this change.
Thank you!