Fix fast FileDownload embed=True style

[MarcSkovMadsen]

Closes #5874

The example from the issue looks like

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (51adf14) 72.36% compared to head (d01368c) 83.93%.
Report is 15 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5875       +/-   ##
===========================================
+ Coverage   72.36%   83.93%   +11.57%     
===========================================
  Files         290      290               
  Lines       42236    42391      +155     
===========================================
+ Hits        30562    35580     +5018     
+ Misses      11674     6811     -4863     

Flag	Coverage Δ
ui-tests	40.89% <ø> (?)
unitexamples-tests	72.27% <ø> (-0.09%)	⬇️

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[MarcSkovMadsen]

The failing tests are ui tests of the chat interface that time out. I don't think its related.

[hoxbro]

The failing tests are ui tests of the chat interface that time out. I don't think its related.

It is unrelated, but the tests are in the unit test, not the UI test. I thought I fixed these yesterday. There could be a more underlying issue with the chat components. But all of this has nothing to do with this PR. @ahuang11, can you look at why the chat tests are flaky and open a new issue / PR with your findings?