Fix initialization of cfgDir

[kpengboy]

It is erroring with the message Error: configuring the main config directory: mkdir : no such file or directory because of an inverted comparison accidentally introduced in commit f713dc6.

[mbrt]

Ouch! Thanks a lot for the fix!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.63%. Comparing base (eb87774) to head (3fdfd30).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/gmailctl/cmd/root_cmd.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #422   +/-   ##
=======================================
  Coverage   54.63%   54.63%           
=======================================
  Files          53       53           
  Lines        4448     4448           
=======================================
  Hits         2430     2430           
  Misses       1877     1877           
  Partials      141      141           

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