fix: filed to fix directory when using ./... path

[danteay]

Description

From last release v3.4.0 when using the next command goimports-reviser ./... it throws and error from filepath that provided path is not a valid folder.

This fix removes the suffix /... from the absolute path to get the real valid folder that should be formatted.

Related Issues

#123
#118
#93

[codecov]

Codecov Report

Merging #126 (735f06d) into master (8ec65d1) will increase coverage by 0.54%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   89.53%   90.08%   +0.54%     
==========================================
  Files           8        8              
  Lines         621      625       +4     
==========================================
+ Hits          556      563       +7     
+ Misses         45       43       -2     
+ Partials       20       19       -1     

Flag	Coverage Δ
unittests	90.08% <100.00%> (+0.54%)	⬆️

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Files Changed	Coverage Δ
pkg/astutil/astutil.go	83.33% <ø> (ø)
reviser/dir.go	69.66% <100.00%> (+4.95%)	⬆️

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