Actually use the calculated window width

[fregante]

• Fixes The report table is always wider than terminal #5419

In my tests:

• real: 100 ch
• maxColumns: 98 ch
• printed: 122 ch

I don't know exactly why columnify is returning a line that is that long, but this fixes it.

Demo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.77%. Comparing base (3b8b127) to head (bc39315).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5422   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files          51       51           
  Lines        2855     2855           
  Branches      867      867           
=======================================
  Hits         2820     2820           
  Misses         35       35           

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[willdurand]

Thanks!