[Artwork] Enable building favicon with only schoolbag from original SVG

aleksis/core/static/img/aleksis-icon.svg

@@ -49,4 +49,7 @@
    <path id="puzzle-ul" d="m31.48 20.23c0.9818-0.9818 0.9818-2.563 0-3.544l-10.54-10.54c-0.9818-0.9819-2.563-0.9819-3.545 0l-10.57 10.57c-0.9818 0.9818-0.9818 2.563 6e-6 3.544l10.54 10.54c0.9818 0.9819 2.563 0.9819 3.545 0l3.261-3.261-1.562-1.562 0.0064-0.0069c-0.03229-0.02696-0.06563-0.05145-0.09668-0.08057-1.118-1.118-1.118-2.93 0-4.048 1.118-1.118 2.93-1.118 4.048 0 0.02514 0.0363 0.04485 0.07241 0.0681 0.109l0.0196-0.01948 1.562 1.562zm-23.06 8.969c-1.118-1.118-1.118-2.93-6.1e-6 -4.048 2.984-2.057 5.759 2.228 4.048 4.048-1.118 1.118-2.93 1.118-4.048 0zm5.697-1.652-1.562 1.562-4.045-4.045 1.562-1.562z"/>
   </g>
  </g>
+ <g id="favicon-bag" transform="translate(-46.809258,-7.6499461)" display="none">
+   <use xlink:href="#schoolbag" transform="matrix(2.25,0,0,2.25,-30.62,0)" fill="#ffffff" x="0" y="0" width="100%" height="100%" />
+ </g>
 </svg>