Use fillable=False in output_widget

[mwouts]

Without this argument we don't get to see the table in full, see #360

[github-actions]

Thank you for making this pull request.

Did you know? You can try it on Binder: .

Also, the version of ITables developed in this PR can be installed with pip:

pip install git+https://github.com/mwouts/itables.git@issue_360

(this requires nodejs, see more at Developing ITables)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 87.76%. Comparing base (e6fb0d5) to head (019651d).

Files with missing lines	Patch %	Lines
apps/shiny/issue_360/app.py	70.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #405      +/-   ##
==========================================
- Coverage   87.85%   87.76%   -0.09%     
==========================================
  Files          49       50       +1     
  Lines        1985     1995      +10     
==========================================
+ Hits         1744     1751       +7     
- Misses        241      244       +3     

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