fread no longer skips on skip=0

[ben-schwen]

Closes #7463

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.04%. Comparing base (be67a4d) to head (138dac1).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7484   +/-   ##
=======================================
  Coverage   99.04%   99.04%           
=======================================
  Files          87       87           
  Lines       16671    16671           
=======================================
  Hits        16511    16511           
  Misses        160      160           

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[github-actions]

No obvious timing issues in HEAD=fread_skip_none

Generated via commit 138dac1

Download link for the artifact containing the test results: ↓ atime-results.zip

Task	Duration
R setup and installing dependencies	2 minutes and 54 seconds
Installing different package versions	44 seconds
Running and plotting the test cases	5 minutes and 12 seconds

[aitap]

Excellent, thank you!