Icon Doesn't Support Dark Mode on macOS

[TechRemarker]

On macOS all icons I have in my dock auto show their dark mode when in dark mode, but this app is the one app that is still showing a light mode icon.

[github-actions]

Thanks for your issue. This has been closed because it appears to use an incomplete or outdated issue template.

Please edit this issue to restore the following sections and checkboxes from the current issue template (you do not need to tick the checkboxes):

• ### Before submitting section
• ### Problem and use case section
• ### Proposed behaviour section
• ### Alternatives considered section
• ### macOS and Homebrew context section
• I have searched the issues and pull requests for duplicates.
• I am proposing a specific improvement to BrewUI with a use case and a clear outcome.

This workflow will reopen this issue automatically once they are present. Do not create a new issue for this.