Fix Dropdown inside Sidenav

[SevenOutman]

Close #1650

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[codecov]

Codecov Report

Merging #1956 (55ed223) into main (8df455e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1956      +/-   ##
==========================================
+ Coverage   84.68%   84.71%   +0.02%     
==========================================
  Files         254      254              
  Lines        8040     8040              
  Branches     2179     2178       -1     
==========================================
+ Hits         6809     6811       +2     
  Misses        691      691              
+ Partials      540      538       -2     

Flag	Coverage Δ
ChromeCi	84.67% <100.00%> (+0.02%)	⬆️
Firefox	84.70% <100.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
src/Sidenav/SidenavDropdown.tsx	88.00% <100.00%> (+8.00%)	⬆️

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[simonguo]

'Dropdown' is not defined

应该上一个 PR 中对测试用例的 Dropdown 进行了重命名