test: Increase ConnectButton & Connector test coverage

[thinkasany]

加上 #540 ，就完成codecov的100%覆盖了

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Latest commit: 6f59ad0

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Name	Status	Preview	Comments	Updated (UTC)
ant-design-web3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 26, 2024 1:51am

[github-actions]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6bbfde3) 99.88% compared to head (6f59ad0) 99.97%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #544      +/-   ##
==========================================
+ Coverage   99.88%   99.97%   +0.09%     
==========================================
  Files          96       96              
  Lines        4343     4343              
  Branches      449      449              
==========================================
+ Hits         4338     4342       +4     
+ Misses          5        1       -4     

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