Strip obsolete vim statusline

[fedang]

Some time ago editorconfig was introduced, making statusline obsolete

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.47%. Comparing base (ec9a0ac) to head (1eecbef).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1520   +/-   ##
=======================================
  Coverage   65.47%   65.47%           
=======================================
  Files          51       51           
  Lines        8923     8923           
  Branches     1064     1064           
=======================================
  Hits         5842     5842           
  Misses       3081     3081           

Flag	Coverage Δ
unittests	65.47% <100.00%> (ø)

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