fix favicon viewbox, remove decimals

Signed-off-by: Jan-Christoph Borchardt <hey@jancborchardt.net>

core/img/favicon-mask.svg

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core/img/favicon-touch.svg

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core/img/favicon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" height="32" width="32" viewBox="0 0 32 32"><rect rx="5" ry="5" height="32" width="32" fill="#0082c9"/><path style="text-decoration-color:#000;isolation:auto;mix-blend-mode:normal;block-progression:tb;text-decoration-line:none;text-indent:0;text-transform:none;text-decoration-style:solid" d="M16.023 9.342c-3.126 0-5.75 2.14-6.552 5.02-.7-1.54-2.24-2.632-4.03-2.632-2.436 0-4.44 2.004-4.44 4.44 0 2.438 2.003 4.442 4.44 4.442 1.79 0 3.33-1.092 4.03-2.632.802 2.88 3.427 5.02 6.553 5.02 3.11 0 5.72-2.117 6.538-4.972.713 1.512 2.23 2.584 4 2.584 2.437 0 4.44-2.004 4.44-4.442 0-2.437-2.004-4.44-4.44-4.44-1.77 0-3.288 1.072-4 2.584-.818-2.855-3.428-4.972-6.537-4.972zm0 2.607a4.203 4.203 0 0 1 4.223 4.22 4.203 4.203 0 0 1-4.223 4.223A4.203 4.203 0 0 1 11.8 16.17a4.203 4.203 0 0 1 4.223-4.22zM5.44 14.336c1.028 0 1.834.805 1.834 1.834a1.815 1.815 0 0 1-1.834 1.835 1.815 1.815 0 0 1-1.834-1.834c0-1.028.806-1.833 1.834-1.833zm21.12 0c1.027 0 1.833.805 1.834 1.834 0 1.03-.806 1.835-1.835 1.835a1.815 1.815 0 0 1-1.835-1.834c0-1.028.806-1.833 1.834-1.833z" fill="#fff" color="#000" white-space="normal"/></svg>
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themes/example/core/img/favicon-touch.svg

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themes/example/core/img/favicon.svg

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