update vim mode

[nightwing]

Issue #, if available: fixes #4108

Description of changes:

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[codecov]

Codecov Report

Base: 85.85% // Head: 85.96% // Increases project coverage by +0.10% 🎉

Coverage data is based on head (0eecc76) compared to base (5304519).
Patch coverage: 92.45% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4933      +/-   ##
==========================================
+ Coverage   85.85%   85.96%   +0.10%     
==========================================
  Files         542      542              
  Lines       41142    41398     +256     
  Branches     6516     6552      +36     
==========================================
+ Hits        35324    35587     +263     
+ Misses       5818     5811       -7     

Flag	Coverage Δ
unittests	85.96% <92.45%> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/keyboard/vim.js	89.69% <88.02%> (+0.14%)	⬆️
src/keyboard/vim_test.js	98.59% <96.33%> (+0.32%)	⬆️

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