fix: ctx logger overwrite in egg extend

[czy88840616]

修复egg 框架继承的情况下，提前使用 ctx.logger 输出报错 "[winston] Unknown logger level: INFO" 的情况。错误如截图。

[gitpod-io]

[codecov-io]

Codecov Report

Merging #846 (ddd4249) into 2.x (0051d07) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              2.x     #846      +/-   ##
==========================================
+ Coverage   86.96%   86.99%   +0.02%     
==========================================
  Files         169      170       +1     
  Lines        6761     6776      +15     
  Branches     1309     1311       +2     
==========================================
+ Hits         5880     5895      +15     
  Misses        851      851              
  Partials       30       30              

Impacted Files	Coverage Δ
packages/web/agent.js	100.00% <100.00%> (ø)
packages/web/app.js	82.50% <100.00%> (+0.92%)	⬆️
packages/web/app/extend/agent.js	100.00% <100.00%> (ø)
packages/web/src/framework/web.ts	95.29% <100.00%> (+0.17%)	⬆️

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