Update dark icons for the 'groove' theme

airsonic-main/src/main/webapp/icons/default_dark/clear.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#cdcdcd" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-trash-2"><polyline points="3 6 5 6 21 6"></polyline><path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"></path><line x1="10" y1="11" x2="10" y2="17"></line><line x1="14" y1="11" x2="14" y2="17"></line></svg>

airsonic-main/src/main/webapp/icons/default_dark/repeat_off.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#696969" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-repeat"><polyline points="17 1 21 5 17 9"></polyline><path d="M3 11V9a4 4 0 0 1 4-4h14"></path><polyline points="7 23 3 19 7 15"></polyline><path d="M21 13v2a4 4 0 0 1-4 4H3"></path></svg>

airsonic-main/src/main/webapp/icons/default_dark/repeat_on.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#cdcdcd" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-repeat"><polyline points="17 1 21 5 17 9"></polyline><path d="M3 11V9a4 4 0 0 1 4-4h14"></path><polyline points="7 23 3 19 7 15"></polyline><path d="M21 13v2a4 4 0 0 1-4 4H3"></path></svg>

airsonic-main/src/main/webapp/icons/default_dark/undo.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#cdcdcd" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-rotate-ccw"><polyline points="1 4 1 10 7 10"></polyline><path d="M3.51 15a9 9 0 1 0 2.13-9.36L1 10"></path></svg>