fix: wait egg background task done before destroy tegg ctx

[killagu]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov]

Codecov Report

Base: 92.74% // Head: 92.77% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (16fda00) compared to base (6b31708).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   92.74%   92.77%   +0.02%     
==========================================
  Files         214      214              
  Lines        4492     4509      +17     
  Branches      459      459              
==========================================
+ Hits         4166     4183      +17     
  Misses        326      326              

Impacted Files	Coverage Δ
plugin/tegg/app.ts	100.00% <100.00%> (ø)
plugin/tegg/lib/EggContextCompatibleHook.ts	100.00% <100.00%> (ø)

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