Closes sidebar when chapter in TOC is clicked

[nynaalekhya]

@cdrini closes #377 Closes sidebar when a chapter in TOC is clicked

[codecov[bot]]

Codecov Report

Merging #582 (e70f5d4) into master (0b5460f) will increase coverage by 0.03%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #582      +/-   ##
==========================================
+ Coverage   65.71%   65.75%   +0.03%     
==========================================
  Files          35       35              
  Lines        3754     3755       +1     
  Branches      704      704              
==========================================
+ Hits         2467     2469       +2     
+ Misses       1035     1034       -1     
  Partials      252      252              

Impacted Files	Coverage Δ
src/js/plugins/plugin.chapters.js	76.92% <0.00%> (-0.86%)	:arrow_down:
src/js/plugins/tts/WebTTSEngine.js	66.91% <0.00%> (+1.50%)	:arrow_up:

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