remove double slash comments from css files

[david-wagih]

Why ?

to fix some errors in the css files inside the front end app

How ?

replace the double slashes before the comments with the /* */

Test plan

cd stopes/ui/seamlisten/react_app
npm run build

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[Celebio]

This is for #43

[Celebio]

I think there are also:
react_app/src/common/components/audio/PlayArea.css
react_app/src/common/components/audio/WaveSurfer.css
react_app/src/common/components/table/table.css
react_app/src/common/components/spinners/spinner.css

[david-wagih]

@Celebio I fixed the remaining CSS files as you mentioned

[Celebio]

LGTM