Slightly move cross in volume-mute

This grants better visibility in case of small font size.

src/icons/svg/volume-mute.svg

@@ -1,3 +1,3 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="1536" height="1536">
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+    <path d="M704 288c-17 0-33 7-45 19L326 640H64c-35 0-64 29-64 64v384c0 35 29 64 64 64h262l333 333c12 12 28 19 45 19 35 0 64-29 64-64V352c0-35-29-64-64-64zm295.683 306.451c-7.225 0-14.446 2.767-19.982 8.303l-80.215 80.213c-11.071 11.023-11.071 28.947 0 39.97L1072.549 896l-173.063 173.064c-11.072 11.024-11.072 28.948 0 39.971l80.215 80.211c11.023 11.07 28.946 11.07 39.969 0l173.062-173.062 173.065 173.062c11.023 11.07 28.945 11.07 39.968 0l80.213-80.21c11.073-11.024 11.073-28.948 0-39.972L1312.918 896l173.06-173.063c11.071-11.023 11.071-28.947 0-39.97l-80.213-80.213c-11.023-11.07-28.945-11.07-39.968 0l-173.065 173.062-173.062-173.062a28.175 28.175 0 0 0-19.987-8.303z"/>
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