Revert "Enlarged stop icons to match disconnect #16929"

This reverts commit 7ecae478.

src/vs/workbench/parts/debug/browser/media/stop-inverse.svg

-<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><defs><style>.cls-1{fill:none;}.cls-2{fill:#f48771;}</style></defs><title>stop-inverse</title><rect class="cls-1" width="16" height="16"/><path class="cls-2" d="M14,14H2V2H14Z"/></svg>
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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" enable-background="new 0 0 16 16" height="16" width="16"><path fill="#2D2D30" d="M13 13h-10v-10h10v10z"/><path fill="#F48771" d="M12 12h-8v-8h8v8z"/></svg>
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src/vs/workbench/parts/debug/browser/media/stop.svg

-<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><defs><style>.cls-1{fill:#a1260d;}.cls-2{fill:none;}</style></defs><title>stop</title><path class="cls-1" d="M14,14H2V2H14Z"/><rect class="cls-2" width="16" height="16"/></svg>
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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" enable-background="new 0 0 16 16" height="16" width="16"><path fill="#F6F6F6" d="M13 13h-10v-10h10v10z"/><path fill="#A1260D" d="M12 12h-8v-8h8v8z"/></svg>
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