other: removes the percent sign from battery widget labels

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Issue

If applicable, what issue does this address?

Closes: #1239

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.65 ⚠️

Comparison is base (beef65a) 32.50% compared to head (3efde01) 31.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1244      +/-   ##
==========================================
- Coverage   32.50%   31.86%   -0.65%     
==========================================
  Files          93       97       +4     
  Lines       16222    16575     +353     
==========================================
+ Hits         5273     5281       +8     
- Misses      10949    11294     +345     

Flag	Coverage Δ
macos-12	33.44% <0.00%> (ø)
ubuntu-latest	33.44% <0.00%> (ø)
windows-2019	33.70% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/canvas/widgets/battery_display.rs	0.00% <0.00%> (ø)

... and 12 files with indirect coverage changes

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