Fix update widget error

[ahuang11]

To start, I don't know if this is the ideal solution, but there's no more errors initially and the app works as expected.

The issue is that _update_data gets called before self._update_widget is set (so before init), but I have no idea how/why _update_data is getting called inside the super().__init__.

If I try to move

self._update_widget = pn.Param(self.param['update'], widgets={'update': {'button_type': 'success'}})[0]

before super().__init__, it complains about lumen.validation.ValidationError: '' table could not be found in Intake catalog.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2350515) 69.39% compared to head (e2529f4) 69.37%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
- Coverage   69.39%   69.37%   -0.02%     
==========================================
  Files          79       79              
  Lines        9190     9193       +3     
==========================================
+ Hits         6377     6378       +1     
- Misses       2813     2815       +2     

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[github-actions]

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