chore: fix ungroupedsection being shown

[richardshiue]

fixes #3951

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (31e9a0b) 61.11% compared to head (051b6c7) 61.11%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3953   +/-   ##
=======================================
  Coverage   61.11%   61.11%           
=======================================
  Files         614      614           
  Lines       28545    28546    +1     
=======================================
+ Hits        17446    17447    +1     
  Misses      11099    11099           

Flag	Coverage Δ
appflowy_flutter_integrateion_test	59.32% <100.00%> (+<0.01%)	⬆️
appflowy_flutter_unit_test	10.82% <66.66%> (+<0.01%)	⬆️

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