fix mastodon icon different from others

public/svg/mastodon.svg

-<svg xmlns="http://www.w3.org/2000/svg" width="61.076954mm" height="65.47831mm" viewBox="0 0 216.4144 232.00976">
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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1536 1792">
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