Changing ban flag color in spam2 to red

[nikhilnarla]

Changed the color of the ban flag in spam2 to red.

Fixes #11179

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[gitpod-io]

[github-actions]

This pull request generated screenshots of many common pages in the running app. You should be able to download and view them here:
https://github.com/publiclab/plots2/suites/6912876115/artifacts/268584106

[codeclimate]

Code Climate has analyzed commit 4f8fcf4 and detected 0 issues on this pull request.

View more on Code Climate.

[github-actions]

This pull request generated screenshots of many common pages in the running app. You should be able to download and view them here:
https://github.com/publiclab/plots2/suites/6930931659/artifacts/269759172

[TildaDares]

Great work @nikhilnarla. Thank you!!

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