fix(whiteboard): set Excalidraw asset path without an inline script

Maximilian Fußrequested to merge
m.fuss/web-app:3617-backport-whiteboard-set-excalidraw-asset-path-without-an-inline-script-to-v26-2-x-v2-9-x into release/v2.9.x

fix(whiteboard): set Excalidraw asset path without an inline script

Closes #3617 (closed)

(cherry picked from commit 629bf885)

Closes #3617 (closed)

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