g3-dpi: fix default IMAP max idle count values

[zh-jq-b]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.47%. Comparing base (7157777) to head (d3cde48).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #558      +/-   ##
==========================================
+ Coverage   54.34%   54.47%   +0.13%     
==========================================
  Files        1182     1182              
  Lines      109049   109049              
==========================================
+ Hits        59258    59401     +143     
+ Misses      49791    49648     -143     

Flag	Coverage Δ
g3bench	31.53% <0.00%> (ø)
g3proxy	54.01% <100.00%> (+0.14%)	⬆️
lib	24.98% <0.00%> (-0.01%)	⬇️

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