fix: SVG font loading from unpkg.com due to undefined version

[jonesbusy]

Looks the Vite migration done on 4892468

Renamed from vars but one was missed.

I found this issue when trying to investigate font that were not loaded from SVG

    <style class="style-fonts">
      @font-face {
        font-family: "Virgil";
        src: url("https://unpkg.com/@excalidraw/excalidraw@undefined/dist/excalidraw-assets/Virgil.woff2");
      }
      @font-face {
        font-family: "Cascadia";
        src: url("https://unpkg.com/@excalidraw/excalidraw@undefined/dist/excalidraw-assets/Cascadia.woff2");
      }
      @font-face {
        font-family: "Assistant";
        src: url("https://unpkg.com/@excalidraw/excalidraw@undefined/dist/excalidraw-assets/Assistant-Regular.woff2");
      }
    </style>

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[jonesbusy]

Any news here ?