fix: refresh accounts when connect to gateway

[simlecode]

关联的Issues (Related Issues)

close

改动 (Proposed Changes)

1. wallet 新加另一个 account
2. gateway 重启后会发现第 1 步中 wallet 新加的 account 没有注册到 gateway

附注 (Additional Info)

自查清单 (Checklist)

在你认为本 PR 满足被审阅的标准之前，需要确保 / Before you mark the PR ready for review, please make sure that:

• 符合Venus项目管理规范中关于PR的相关标准 / The PR follows the PR standards set out in the Venus project management guidelines
• 具有清晰明确的commit message / All commits have a clear commit message.
• 包含相关的的测试用例或者不需要新增测试用例 / This PR has tests for new functionality or change in behaviour or not need to add new tests.
• 包含相关的的指南以及文档或者不需要新增文档 / This PR has updated usage guidelines and documentation or not need
• 通过必要的检查项 / All checks are green

[codecov-commenter]

Codecov Report

Merging #158 (4186c59) into master (1051ee5) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #158      +/-   ##
==========================================
- Coverage   58.14%   58.12%   -0.03%     
==========================================
  Files          33       33              
  Lines        2406     2407       +1     
==========================================
  Hits         1399     1399              
  Misses        937      937              
- Partials       70       71       +1     

Flag	Coverage Δ
unittests	58.12% <100.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
walletevent/wallet_client.go	67.64% <100.00%> (+0.23%)	⬆️

... and 2 files with indirect coverage changes

[LinZexiao]

LGTM